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DMARC=BESTGUESSPASS
Looking at the headers within the mail received with my Office365 domain I see dmarc=bestguesspass. BestGuessPass? That’s a new. A few days after seeing dmarc=bestguesspass, Terry Zink at Microsoft posted an explanation.Exchange Online Protection, the filtering system for Office365, is analyzing the authentication of incoming emails and if the domain is not publishing a AUTHENTICATING WITH SPF: -ALL OR ~ALL What is SPF? Sender policy framework (SPF, RFC 7208) is an authentication process that ties the 5321.from (also known as the mail from, envelope from or return path) to authorized sending IP addresses.This authorization is published in a TXT record in DNS. Receivers can check SPF at the beginning of a SMTP transaction, compare the 5321.from domain to the connecting IP address and GRADUAL DMARC ROLLOUT So I could start rolling out DMARC like this: “ p=none “: I don’t want any DMARC enforced, but I’d like reports on every mail that isn’t authenticated. “ p=quarantine; pct=5 “: I still want reports, and I’d like about 5% of non-authenticated mail to be quarantined. See if anyone complains. “ SPF ?ALL | WORD TO THE WISE The most read post on the blog is Authenticating with SPF: -all or ~all.In fact, it’s in the top 5 posts every single day. We still get comments on it, too. Usually from folks who disagree with myrecommendations.
A BRIEF GUIDE TO SPAMTRAPS A brief guide to spamtraps. “I thought spamtraps were addresses harvested off webpages.”. “I thought spamtraps were addresses that were valid and now aren’t.”. “I thought spamtraps were addresses created to catch spammers.”. There is a lot of “I thought” about spamtraps. Most of the theories are accurate but limited. DKIM - WORD TO THE WISE DKIM Domain Keys Identified Mail. DKIM. Check a DKIM key record. Keyrecord.
ALICE AND BOB SIGN MESSAGES Alice and Bob can send messages privately via a nosy postman, but how does Bob know that a message he receives is really from Alice, rather than from the postman pretending to be Alice? If they’re using symmetric-key encryption, and Bob is sure that he was talking to Alice when they exchanged keys, then he already knows that the mail is from Alice – as only he and Alice have the keys that WHAT’S A SUSPICIOUS DOMAIN? It’s not just the mail the domain is present in. There are other things that lead to suspicion for domains, too. Domain . is located on a network with a bad reputation. is newly registered. has network connections to bad domains (like nameservers, etc) is a cousin domain to some regular domain. has a name pattern like snowshoers use. DMARC - WORD TO THE WISE Field Value; v (Version): DMARC1 p (Requested Mail Receiver Policy): none sp (Subdomain Policy): quarantine rua (Aggregate Feedback Report Destinations): mailto:mailauth-reports@google.com Email reports to mailauth-reports@google.com ()DMARC P=REJECT
DMARC p=reject. March 30, 2016 by steve in Technical. Mail.ru is switching to p=reject. This means that you should special-case mail.ru wherever . Actually, no. Time to change that script. If you operate an ESP or develop mailing list software you should be checking whether the email address that is being used in the From: address of emailDMARC=BESTGUESSPASS
Looking at the headers within the mail received with my Office365 domain I see dmarc=bestguesspass. BestGuessPass? That’s a new. A few days after seeing dmarc=bestguesspass, Terry Zink at Microsoft posted an explanation.Exchange Online Protection, the filtering system for Office365, is analyzing the authentication of incoming emails and if the domain is not publishing a AUTHENTICATING WITH SPF: -ALL OR ~ALL What is SPF? Sender policy framework (SPF, RFC 7208) is an authentication process that ties the 5321.from (also known as the mail from, envelope from or return path) to authorized sending IP addresses.This authorization is published in a TXT record in DNS. Receivers can check SPF at the beginning of a SMTP transaction, compare the 5321.from domain to the connecting IP address and GRADUAL DMARC ROLLOUT So I could start rolling out DMARC like this: “ p=none “: I don’t want any DMARC enforced, but I’d like reports on every mail that isn’t authenticated. “ p=quarantine; pct=5 “: I still want reports, and I’d like about 5% of non-authenticated mail to be quarantined. See if anyone complains. “ SPF ?ALL | WORD TO THE WISE The most read post on the blog is Authenticating with SPF: -all or ~all.In fact, it’s in the top 5 posts every single day. We still get comments on it, too. Usually from folks who disagree with myrecommendations.
A BRIEF GUIDE TO SPAMTRAPS A brief guide to spamtraps. “I thought spamtraps were addresses harvested off webpages.”. “I thought spamtraps were addresses that were valid and now aren’t.”. “I thought spamtraps were addresses created to catch spammers.”. There is a lot of “I thought” about spamtraps. Most of the theories are accurate but limited. DKIM - WORD TO THE WISE DKIM Domain Keys Identified Mail. DKIM. Check a DKIM key record. Keyrecord.
ALICE AND BOB SIGN MESSAGES Alice and Bob can send messages privately via a nosy postman, but how does Bob know that a message he receives is really from Alice, rather than from the postman pretending to be Alice? If they’re using symmetric-key encryption, and Bob is sure that he was talking to Alice when they exchanged keys, then he already knows that the mail is from Alice – as only he and Alice have the keys that WHAT’S A SUSPICIOUS DOMAIN? It’s not just the mail the domain is present in. There are other things that lead to suspicion for domains, too. Domain . is located on a network with a bad reputation. is newly registered. has network connections to bad domains (like nameservers, etc) is a cousin domain to some regular domain. has a name pattern like snowshoers use. DMARC - WORD TO THE WISE Field Value; v (Version): DMARC1 p (Requested Mail Receiver Policy): none sp (Subdomain Policy): quarantine rua (Aggregate Feedback Report Destinations): mailto:mailauth-reports@google.com Email reports to mailauth-reports@google.com ()DMARC P=REJECT
DMARC p=reject. March 30, 2016 by steve in Technical. Mail.ru is switching to p=reject. This means that you should special-case mail.ru wherever . Actually, no. Time to change that script. If you operate an ESP or develop mailing list software you should be checking whether the email address that is being used in the From: address of email ABOUT THE APPLE THING A lot of folks are talking about Apple’s recent announcement about building privacy protection into email. I have somewhat stayed out of the conversation and I’m not sure what I JUNE | 2021 | WORD TO THE WISE A lot of folks are talking about Apple’s recent announcement about building privacy protection into email. I have somewhat stayed out of the conversation and I’m not sure what I really think about it. WISETOOLS - WORD TO THE WISE wiseTools. Useful tools for email people. DNS. Convert Names to IP addresses. Convert IP addresses to names. Find Mail servers. Authentication. Validate SPF and A BRIEF GUIDE TO SPAMTRAPS A brief guide to spamtraps. “I thought spamtraps were addresses harvested off webpages.”. “I thought spamtraps were addresses that were valid and now aren’t.”. “I thought spamtraps were addresses created to catch spammers.”. There is a lot of “I thought” about spamtraps. Most of the theories are accurate but limited.IMPLIED PERMISSION
Implied permission. Codified into law in CASL, implied permission describes the situation where a company can legally mail someone. The law includes caveats and restrictions about when this is a legitimate assumption on the part of the company. It is, in fact, a kludge. There isn’t such a thing as implied permission. ALICE AND BOB SIGN MESSAGES Alice and Bob can send messages privately via a nosy postman, but how does Bob know that a message he receives is really from Alice, rather than from the postman pretending to be Alice? If they’re using symmetric-key encryption, and Bob is sure that he was talking to Alice when they exchanged keys, then he already knows that the mail is from Alice – as only he and Alice have the keys that SHARING ACCESS TO GOOGLE POSTMASTER TOOLS As a delivery consultant, I always ask clients to share their Google postmaster reports with me. As Gmail is one of the bigger delivery challenges for a lot of senders,AUTHENTICATION
DMARC Domain-based Message Authentication, Reporting and Conformance. Check a DMARC policy. Policy record.DKIM KEY ROTATION
Add the new public key to your DNS servers. Check that the new public key is visible on each of your public DNS servers. Start signing outgoing mail with your new selector and new private key. Wait 24 hours. Delete the old public key from your DNS servers. DNS negative caching can cause some minor problems, if you’re not careful – ifa DNS
WHY DOES IT TAKE TWO WEEKS TO PROCESS AN UNSUBSCRIBE An unsubscription request will often take effect instantly and it would be rare that it would take more than a few business days. So why do some businesses say your email address will be removed “within 10 business days” when they know it’ll be almost immediate? It’s better to underpromise and overdeliver. No recipient is going to beDMARC=BESTGUESSPASS
Looking at the headers within the mail received with my Office365 domain I see dmarc=bestguesspass. BestGuessPass? That’s a new. A few days after seeing dmarc=bestguesspass, Terry Zink at Microsoft posted an explanation.Exchange Online Protection, the filtering system for Office365, is analyzing the authentication of incoming emails and if the domain is not publishing a AUTHENTICATING WITH SPF: -ALL OR ~ALL What is SPF? Sender policy framework (SPF, RFC 7208) is an authentication process that ties the 5321.from (also known as the mail from, envelope from or return path) to authorized sending IP addresses.This authorization is published in a TXT record in DNS. Receivers can check SPF at the beginning of a SMTP transaction, compare the 5321.from domain to the connecting IP address and GRADUAL DMARC ROLLOUT So I could start rolling out DMARC like this: “ p=none “: I don’t want any DMARC enforced, but I’d like reports on every mail that isn’t authenticated. “ p=quarantine; pct=5 “: I still want reports, and I’d like about 5% of non-authenticated mail to be quarantined. See if anyone complains. “ SPF ?ALL | WORD TO THE WISE The most read post on the blog is Authenticating with SPF: -all or ~all.In fact, it’s in the top 5 posts every single day. We still get comments on it, too. Usually from folks who disagree with myrecommendations.
A BRIEF GUIDE TO SPAMTRAPS A brief guide to spamtraps. “I thought spamtraps were addresses harvested off webpages.”. “I thought spamtraps were addresses that were valid and now aren’t.”. “I thought spamtraps were addresses created to catch spammers.”. There is a lot of “I thought” about spamtraps. Most of the theories are accurate but limited. DKIM - WORD TO THE WISE DKIM Domain Keys Identified Mail. DKIM. Check a DKIM key record. Keyrecord.
ALICE AND BOB SIGN MESSAGES Alice and Bob can send messages privately via a nosy postman, but how does Bob know that a message he receives is really from Alice, rather than from the postman pretending to be Alice? If they’re using symmetric-key encryption, and Bob is sure that he was talking to Alice when they exchanged keys, then he already knows that the mail is from Alice – as only he and Alice have the keys that WHAT’S A SUSPICIOUS DOMAIN? It’s not just the mail the domain is present in. There are other things that lead to suspicion for domains, too. Domain . is located on a network with a bad reputation. is newly registered. has network connections to bad domains (like nameservers, etc) is a cousin domain to some regular domain. has a name pattern like snowshoers use. DMARC - WORD TO THE WISE Field Value; v (Version): DMARC1 p (Requested Mail Receiver Policy): none sp (Subdomain Policy): quarantine rua (Aggregate Feedback Report Destinations): mailto:mailauth-reports@google.com Email reports to mailauth-reports@google.com ()DMARC P=REJECT
DMARC p=reject. March 30, 2016 by steve in Technical. Mail.ru is switching to p=reject. This means that you should special-case mail.ru wherever . Actually, no. Time to change that script. If you operate an ESP or develop mailing list software you should be checking whether the email address that is being used in the From: address of emailDMARC=BESTGUESSPASS
Looking at the headers within the mail received with my Office365 domain I see dmarc=bestguesspass. BestGuessPass? That’s a new. A few days after seeing dmarc=bestguesspass, Terry Zink at Microsoft posted an explanation.Exchange Online Protection, the filtering system for Office365, is analyzing the authentication of incoming emails and if the domain is not publishing a AUTHENTICATING WITH SPF: -ALL OR ~ALL What is SPF? Sender policy framework (SPF, RFC 7208) is an authentication process that ties the 5321.from (also known as the mail from, envelope from or return path) to authorized sending IP addresses.This authorization is published in a TXT record in DNS. Receivers can check SPF at the beginning of a SMTP transaction, compare the 5321.from domain to the connecting IP address and GRADUAL DMARC ROLLOUT So I could start rolling out DMARC like this: “ p=none “: I don’t want any DMARC enforced, but I’d like reports on every mail that isn’t authenticated. “ p=quarantine; pct=5 “: I still want reports, and I’d like about 5% of non-authenticated mail to be quarantined. See if anyone complains. “ SPF ?ALL | WORD TO THE WISE The most read post on the blog is Authenticating with SPF: -all or ~all.In fact, it’s in the top 5 posts every single day. We still get comments on it, too. Usually from folks who disagree with myrecommendations.
A BRIEF GUIDE TO SPAMTRAPS A brief guide to spamtraps. “I thought spamtraps were addresses harvested off webpages.”. “I thought spamtraps were addresses that were valid and now aren’t.”. “I thought spamtraps were addresses created to catch spammers.”. There is a lot of “I thought” about spamtraps. Most of the theories are accurate but limited. DKIM - WORD TO THE WISE DKIM Domain Keys Identified Mail. DKIM. Check a DKIM key record. Keyrecord.
ALICE AND BOB SIGN MESSAGES Alice and Bob can send messages privately via a nosy postman, but how does Bob know that a message he receives is really from Alice, rather than from the postman pretending to be Alice? If they’re using symmetric-key encryption, and Bob is sure that he was talking to Alice when they exchanged keys, then he already knows that the mail is from Alice – as only he and Alice have the keys that WHAT’S A SUSPICIOUS DOMAIN? It’s not just the mail the domain is present in. There are other things that lead to suspicion for domains, too. Domain . is located on a network with a bad reputation. is newly registered. has network connections to bad domains (like nameservers, etc) is a cousin domain to some regular domain. has a name pattern like snowshoers use. DMARC - WORD TO THE WISE Field Value; v (Version): DMARC1 p (Requested Mail Receiver Policy): none sp (Subdomain Policy): quarantine rua (Aggregate Feedback Report Destinations): mailto:mailauth-reports@google.com Email reports to mailauth-reports@google.com ()DMARC P=REJECT
DMARC p=reject. March 30, 2016 by steve in Technical. Mail.ru is switching to p=reject. This means that you should special-case mail.ru wherever . Actually, no. Time to change that script. If you operate an ESP or develop mailing list software you should be checking whether the email address that is being used in the From: address of email ABOUT THE APPLE THING A lot of folks are talking about Apple’s recent announcement about building privacy protection into email. I have somewhat stayed out of the conversation and I’m not sure what I JUNE | 2021 | WORD TO THE WISE A lot of folks are talking about Apple’s recent announcement about building privacy protection into email. I have somewhat stayed out of the conversation and I’m not sure what I really think about it. WISETOOLS - WORD TO THE WISE wiseTools. Useful tools for email people. DNS. Convert Names to IP addresses. Convert IP addresses to names. Find Mail servers. Authentication. Validate SPF and A BRIEF GUIDE TO SPAMTRAPS A brief guide to spamtraps. “I thought spamtraps were addresses harvested off webpages.”. “I thought spamtraps were addresses that were valid and now aren’t.”. “I thought spamtraps were addresses created to catch spammers.”. There is a lot of “I thought” about spamtraps. Most of the theories are accurate but limited.IMPLIED PERMISSION
Implied permission. Codified into law in CASL, implied permission describes the situation where a company can legally mail someone. The law includes caveats and restrictions about when this is a legitimate assumption on the part of the company. It is, in fact, a kludge. There isn’t such a thing as implied permission. ALICE AND BOB SIGN MESSAGES Alice and Bob can send messages privately via a nosy postman, but how does Bob know that a message he receives is really from Alice, rather than from the postman pretending to be Alice? If they’re using symmetric-key encryption, and Bob is sure that he was talking to Alice when they exchanged keys, then he already knows that the mail is from Alice – as only he and Alice have the keys that SHARING ACCESS TO GOOGLE POSTMASTER TOOLS As a delivery consultant, I always ask clients to share their Google postmaster reports with me. As Gmail is one of the bigger delivery challenges for a lot of senders,AUTHENTICATION
DMARC Domain-based Message Authentication, Reporting and Conformance. Check a DMARC policy. Policy record.DKIM KEY ROTATION
Add the new public key to your DNS servers. Check that the new public key is visible on each of your public DNS servers. Start signing outgoing mail with your new selector and new private key. Wait 24 hours. Delete the old public key from your DNS servers. DNS negative caching can cause some minor problems, if you’re not careful – ifa DNS
WHY DOES IT TAKE TWO WEEKS TO PROCESS AN UNSUBSCRIBE An unsubscription request will often take effect instantly and it would be rare that it would take more than a few business days. So why do some businesses say your email address will be removed “within 10 business days” when they know it’ll be almost immediate? It’s better to underpromise and overdeliver. No recipient is going to be AUTHENTICATING WITH SPF: -ALL OR ~ALL What is SPF? Sender policy framework (SPF, RFC 7208) is an authentication process that ties the 5321.from (also known as the mail from, envelope from or return path) to authorized sending IP addresses.This authorization is published in a TXT record in DNS. Receivers can check SPF at the beginning of a SMTP transaction, compare the 5321.from domain to the connecting IP address andDMARC=BESTGUESSPASS
Looking at the headers within the mail received with my Office365 domain I see dmarc=bestguesspass. BestGuessPass? That’s a new. A few days after seeing dmarc=bestguesspass, Terry Zink at Microsoft posted an explanation.Exchange Online Protection, the filtering system for Office365, is analyzing the authentication of incoming emails and if the domain is not publishing a SPF ?ALL | WORD TO THE WISE The most read post on the blog is Authenticating with SPF: -all or ~all.In fact, it’s in the top 5 posts every single day. We still get comments on it, too. Usually from folks who disagree with myrecommendations.
CRYPTOGRAPHY WITH ALICE AND BOB Public-Key Encryption. This time, Alice and Bob don’t ever need to meet. First Bob buys a padlock and matching key. Then Bob mails the (unlocked) padlock to Alice, keeping the key safe. Alice buys a simple lockbox that closes with a padlock, and puts her message in it. Then she locks it with Bob’s padlock, and mails it to Bob. A BRIEF GUIDE TO SPAMTRAPS A brief guide to spamtraps. “I thought spamtraps were addresses harvested off webpages.”. “I thought spamtraps were addresses that were valid and now aren’t.”. “I thought spamtraps were addresses created to catch spammers.”. There is a lot of “I thought” about spamtraps. Most of the theories are accurate but limited. DKIM - WORD TO THE WISE DKIM Domain Keys Identified Mail. DKIM. Check a DKIM key record. Keyrecord.
ALICE AND BOB SIGN MESSAGES Alice and Bob can send messages privately via a nosy postman, but how does Bob know that a message he receives is really from Alice, rather than from the postman pretending to be Alice? If they’re using symmetric-key encryption, and Bob is sure that he was talking to Alice when they exchanged keys, then he already knows that the mail is from Alice – as only he and Alice have the keys that DNS, SERVFAIL, FIREWALLS AND MICROSOFT DNS, SERVFAIL, firewalls and Microsoft. When you look up a host name, a mailserver or anything else there are three types of reply you can get. The way they’re described varies from tool to tool, but they’re most commonly referred to using the messages dig returns – NXDOMAIN, NOERROR and SERVFAIL. NXDOMAIN is the simplest – it meansDMARC P=REJECT
DMARC p=reject. March 30, 2016 by steve in Technical. Mail.ru is switching to p=reject. This means that you should special-case mail.ru wherever . Actually, no. Time to change that script. If you operate an ESP or develop mailing list software you should be checking whether the email address that is being used in the From: address of email WHICH IS BETTER UTF-8 OR ISO-? If you don’t have someone like that, UTF-8 is your best bet. If your tool chain supports non-ASCII messages, and you want to choose a single encoding, go with UTF-8. If the UTF-8 you end up sending is entirely, or almost entirely, ASCII then this will render well even on the tiny fraction of mail clients that don’t support character sets. AUTHENTICATING WITH SPF: -ALL OR ~ALL What is SPF? Sender policy framework (SPF, RFC 7208) is an authentication process that ties the 5321.from (also known as the mail from, envelope from or return path) to authorized sending IP addresses.This authorization is published in a TXT record in DNS. Receivers can check SPF at the beginning of a SMTP transaction, compare the 5321.from domain to the connecting IP address andDMARC=BESTGUESSPASS
Looking at the headers within the mail received with my Office365 domain I see dmarc=bestguesspass. BestGuessPass? That’s a new. A few days after seeing dmarc=bestguesspass, Terry Zink at Microsoft posted an explanation.Exchange Online Protection, the filtering system for Office365, is analyzing the authentication of incoming emails and if the domain is not publishing a SPF ?ALL | WORD TO THE WISE The most read post on the blog is Authenticating with SPF: -all or ~all.In fact, it’s in the top 5 posts every single day. We still get comments on it, too. Usually from folks who disagree with myrecommendations.
CRYPTOGRAPHY WITH ALICE AND BOB Public-Key Encryption. This time, Alice and Bob don’t ever need to meet. First Bob buys a padlock and matching key. Then Bob mails the (unlocked) padlock to Alice, keeping the key safe. Alice buys a simple lockbox that closes with a padlock, and puts her message in it. Then she locks it with Bob’s padlock, and mails it to Bob. A BRIEF GUIDE TO SPAMTRAPS A brief guide to spamtraps. “I thought spamtraps were addresses harvested off webpages.”. “I thought spamtraps were addresses that were valid and now aren’t.”. “I thought spamtraps were addresses created to catch spammers.”. There is a lot of “I thought” about spamtraps. Most of the theories are accurate but limited. DKIM - WORD TO THE WISE DKIM Domain Keys Identified Mail. DKIM. Check a DKIM key record. Keyrecord.
ALICE AND BOB SIGN MESSAGES Alice and Bob can send messages privately via a nosy postman, but how does Bob know that a message he receives is really from Alice, rather than from the postman pretending to be Alice? If they’re using symmetric-key encryption, and Bob is sure that he was talking to Alice when they exchanged keys, then he already knows that the mail is from Alice – as only he and Alice have the keys that DNS, SERVFAIL, FIREWALLS AND MICROSOFT DNS, SERVFAIL, firewalls and Microsoft. When you look up a host name, a mailserver or anything else there are three types of reply you can get. The way they’re described varies from tool to tool, but they’re most commonly referred to using the messages dig returns – NXDOMAIN, NOERROR and SERVFAIL. NXDOMAIN is the simplest – it meansDMARC P=REJECT
DMARC p=reject. March 30, 2016 by steve in Technical. Mail.ru is switching to p=reject. This means that you should special-case mail.ru wherever . Actually, no. Time to change that script. If you operate an ESP or develop mailing list software you should be checking whether the email address that is being used in the From: address of email WHICH IS BETTER UTF-8 OR ISO-? If you don’t have someone like that, UTF-8 is your best bet. If your tool chain supports non-ASCII messages, and you want to choose a single encoding, go with UTF-8. If the UTF-8 you end up sending is entirely, or almost entirely, ASCII then this will render well even on the tiny fraction of mail clients that don’t support character sets.WORD TO THE WISE
Word to the Wise helps email marketers create more effective email messages, programs and infrastructures. We advise you how to skillfully navigate the constant business, technology, and policy challenges so your messages reach your customers. Services. JUNE | 2021 | WORD TO THE WISE A lot of folks are talking about Apple’s recent announcement about building privacy protection into email. I have somewhat stayed out of the conversation and I’m not sure what I really think about it. ABOUT THE APPLE THING A lot of folks are talking about Apple’s recent announcement about building privacy protection into email. I have somewhat stayed out of the conversation and I’m not sure what I WISETOOLS - WORD TO THE WISE wiseTools. Useful tools for email people. DNS. Convert Names to IP addresses. Convert IP addresses to names. Find Mail servers. Authentication. Validate SPF and IMAGES IN THE SUBJECT LINE While you can scatter any images you like across the body of your message, the subject line is limited to just text. But “text” is more than just “a, b, c” – using RFC 2047 encoding you can use any character you like, including many tiny pictures. Experian, Vertical Response and Bronto all have some interesting things to sayabout the
A BRIEF GUIDE TO SPAMTRAPS A brief guide to spamtraps. “I thought spamtraps were addresses harvested off webpages.”. “I thought spamtraps were addresses that were valid and now aren’t.”. “I thought spamtraps were addresses created to catch spammers.”. There is a lot of “I thought” about spamtraps. Most of the theories are accurate but limited.NULL SENDER ADDRESS
Yes, you can and it’s commonly used for some types of email. 5321.from is the bounce address, and the domain used in SPF authentication. Null addresses, literally , are used for email where it’s not important to know if it wasn’t delivered. If the mail fails to deliver it usually is just dropped on the floor and no one ever knows anything. ALICE AND BOB SIGN MESSAGES Alice and Bob can send messages privately via a nosy postman, but how does Bob know that a message he receives is really from Alice, rather than from the postman pretending to be Alice? If they’re using symmetric-key encryption, and Bob is sure that he was talking to Alice when they exchanged keys, then he already knows that the mail is from Alice – as only he and Alice have the keys thatDKIM KEY ROTATION
Add the new public key to your DNS servers. Check that the new public key is visible on each of your public DNS servers. Start signing outgoing mail with your new selector and new private key. Wait 24 hours. Delete the old public key from your DNS servers. DNS negative caching can cause some minor problems, if you’re not careful – ifa DNS
WHY DOES IT TAKE TWO WEEKS TO PROCESS AN UNSUBSCRIBE An unsubscription request will often take effect instantly and it would be rare that it would take more than a few business days. So why do some businesses say your email address will be removed “within 10 business days” when they know it’ll be almost immediate? It’s better to underpromise and overdeliver. No recipient is going to be AUTHENTICATING WITH SPF: -ALL OR ~ALL What is SPF? Sender policy framework (SPF, RFC 7208) is an authentication process that ties the 5321.from (also known as the mail from, envelope from or return path) to authorized sending IP addresses.This authorization is published in a TXT record in DNS. Receivers can check SPF at the beginning of a SMTP transaction, compare the 5321.from domain to the connecting IP address andDMARC=BESTGUESSPASS
Looking at the headers within the mail received with my Office365 domain I see dmarc=bestguesspass. BestGuessPass? That’s a new. A few days after seeing dmarc=bestguesspass, Terry Zink at Microsoft posted an explanation.Exchange Online Protection, the filtering system for Office365, is analyzing the authentication of incoming emails and if the domain is not publishing a SPF ?ALL | WORD TO THE WISE The most read post on the blog is Authenticating with SPF: -all or ~all.In fact, it’s in the top 5 posts every single day. We still get comments on it, too. Usually from folks who disagree with myrecommendations.
CRYPTOGRAPHY WITH ALICE AND BOB Public-Key Encryption. This time, Alice and Bob don’t ever need to meet. First Bob buys a padlock and matching key. Then Bob mails the (unlocked) padlock to Alice, keeping the key safe. Alice buys a simple lockbox that closes with a padlock, and puts her message in it. Then she locks it with Bob’s padlock, and mails it to Bob. A BRIEF GUIDE TO SPAMTRAPS A brief guide to spamtraps. “I thought spamtraps were addresses harvested off webpages.”. “I thought spamtraps were addresses that were valid and now aren’t.”. “I thought spamtraps were addresses created to catch spammers.”. There is a lot of “I thought” about spamtraps. Most of the theories are accurate but limited. DKIM - WORD TO THE WISE DKIM Domain Keys Identified Mail. DKIM. Check a DKIM key record. Keyrecord.
ALICE AND BOB SIGN MESSAGES Alice and Bob can send messages privately via a nosy postman, but how does Bob know that a message he receives is really from Alice, rather than from the postman pretending to be Alice? If they’re using symmetric-key encryption, and Bob is sure that he was talking to Alice when they exchanged keys, then he already knows that the mail is from Alice – as only he and Alice have the keys that DNS, SERVFAIL, FIREWALLS AND MICROSOFT DNS, SERVFAIL, firewalls and Microsoft. When you look up a host name, a mailserver or anything else there are three types of reply you can get. The way they’re described varies from tool to tool, but they’re most commonly referred to using the messages dig returns – NXDOMAIN, NOERROR and SERVFAIL. NXDOMAIN is the simplest – it meansDMARC P=REJECT
DMARC p=reject. March 30, 2016 by steve in Technical. Mail.ru is switching to p=reject. This means that you should special-case mail.ru wherever . Actually, no. Time to change that script. If you operate an ESP or develop mailing list software you should be checking whether the email address that is being used in the From: address of email WHICH IS BETTER UTF-8 OR ISO-? If you don’t have someone like that, UTF-8 is your best bet. If your tool chain supports non-ASCII messages, and you want to choose a single encoding, go with UTF-8. If the UTF-8 you end up sending is entirely, or almost entirely, ASCII then this will render well even on the tiny fraction of mail clients that don’t support character sets. AUTHENTICATING WITH SPF: -ALL OR ~ALL What is SPF? Sender policy framework (SPF, RFC 7208) is an authentication process that ties the 5321.from (also known as the mail from, envelope from or return path) to authorized sending IP addresses.This authorization is published in a TXT record in DNS. Receivers can check SPF at the beginning of a SMTP transaction, compare the 5321.from domain to the connecting IP address andDMARC=BESTGUESSPASS
Looking at the headers within the mail received with my Office365 domain I see dmarc=bestguesspass. BestGuessPass? That’s a new. A few days after seeing dmarc=bestguesspass, Terry Zink at Microsoft posted an explanation.Exchange Online Protection, the filtering system for Office365, is analyzing the authentication of incoming emails and if the domain is not publishing a SPF ?ALL | WORD TO THE WISE The most read post on the blog is Authenticating with SPF: -all or ~all.In fact, it’s in the top 5 posts every single day. We still get comments on it, too. Usually from folks who disagree with myrecommendations.
CRYPTOGRAPHY WITH ALICE AND BOB Public-Key Encryption. This time, Alice and Bob don’t ever need to meet. First Bob buys a padlock and matching key. Then Bob mails the (unlocked) padlock to Alice, keeping the key safe. Alice buys a simple lockbox that closes with a padlock, and puts her message in it. Then she locks it with Bob’s padlock, and mails it to Bob. A BRIEF GUIDE TO SPAMTRAPS A brief guide to spamtraps. “I thought spamtraps were addresses harvested off webpages.”. “I thought spamtraps were addresses that were valid and now aren’t.”. “I thought spamtraps were addresses created to catch spammers.”. There is a lot of “I thought” about spamtraps. Most of the theories are accurate but limited. DKIM - WORD TO THE WISE DKIM Domain Keys Identified Mail. DKIM. Check a DKIM key record. Keyrecord.
ALICE AND BOB SIGN MESSAGES Alice and Bob can send messages privately via a nosy postman, but how does Bob know that a message he receives is really from Alice, rather than from the postman pretending to be Alice? If they’re using symmetric-key encryption, and Bob is sure that he was talking to Alice when they exchanged keys, then he already knows that the mail is from Alice – as only he and Alice have the keys that DNS, SERVFAIL, FIREWALLS AND MICROSOFT DNS, SERVFAIL, firewalls and Microsoft. When you look up a host name, a mailserver or anything else there are three types of reply you can get. The way they’re described varies from tool to tool, but they’re most commonly referred to using the messages dig returns – NXDOMAIN, NOERROR and SERVFAIL. NXDOMAIN is the simplest – it meansDMARC P=REJECT
DMARC p=reject. March 30, 2016 by steve in Technical. Mail.ru is switching to p=reject. This means that you should special-case mail.ru wherever . Actually, no. Time to change that script. If you operate an ESP or develop mailing list software you should be checking whether the email address that is being used in the From: address of email WHICH IS BETTER UTF-8 OR ISO-? If you don’t have someone like that, UTF-8 is your best bet. If your tool chain supports non-ASCII messages, and you want to choose a single encoding, go with UTF-8. If the UTF-8 you end up sending is entirely, or almost entirely, ASCII then this will render well even on the tiny fraction of mail clients that don’t support character sets.WORD TO THE WISE
Word to the Wise helps email marketers create more effective email messages, programs and infrastructures. We advise you how to skillfully navigate the constant business, technology, and policy challenges so your messages reach your customers. Services. JUNE | 2021 | WORD TO THE WISE A lot of folks are talking about Apple’s recent announcement about building privacy protection into email. I have somewhat stayed out of the conversation and I’m not sure what I really think about it. ABOUT THE APPLE THING A lot of folks are talking about Apple’s recent announcement about building privacy protection into email. I have somewhat stayed out of the conversation and I’m not sure what I WISETOOLS - WORD TO THE WISE wiseTools. Useful tools for email people. DNS. Convert Names to IP addresses. Convert IP addresses to names. Find Mail servers. Authentication. Validate SPF andDMARC P=REJECT
Mail.ru is switching to p=reject. This means that you should special-case mail.ru wherever Actually, no.Time to change that script. If you operate an ESP or develop mailing list software you should be checking whether the email address that is being used in the From: address of email you’re sending is in a domain that’s publishing p=reject (is a “rejective” email address A BRIEF GUIDE TO SPAMTRAPS A brief guide to spamtraps. “I thought spamtraps were addresses harvested off webpages.”. “I thought spamtraps were addresses that were valid and now aren’t.”. “I thought spamtraps were addresses created to catch spammers.”. There is a lot of “I thought” about spamtraps. Most of the theories are accurate but limited. ALICE AND BOB SIGN MESSAGES Alice and Bob can send messages privately via a nosy postman, but how does Bob know that a message he receives is really from Alice, rather than from the postman pretending to be Alice? If they’re using symmetric-key encryption, and Bob is sure that he was talking to Alice when they exchanged keys, then he already knows that the mail is from Alice – as only he and Alice have the keys that IMAGES IN THE SUBJECT LINE While you can scatter any images you like across the body of your message, the subject line is limited to just text. But “text” is more than just “a, b, c” – using RFC 2047 encoding you can use any character you like, including many tiny pictures. Experian, Vertical Response and Bronto all have some interesting things to sayabout the
DNS, SERVFAIL, FIREWALLS AND MICROSOFT DNS, SERVFAIL, firewalls and Microsoft. When you look up a host name, a mailserver or anything else there are three types of reply you can get. The way they’re described varies from tool to tool, but they’re most commonly referred to using the messages dig returns – NXDOMAIN, NOERROR and SERVFAIL. NXDOMAIN is the simplest – it meansDKIM KEY ROTATION
Add the new public key to your DNS servers. Check that the new public key is visible on each of your public DNS servers. Start signing outgoing mail with your new selector and new private key. Wait 24 hours. Delete the old public key from your DNS servers. DNS negative caching can cause some minor problems, if you’re not careful – ifa DNS
WISETOOLS - WORD TO THE WISE wiseTools. Useful tools for email people. DNS. Convert Names to IP addresses. Convert IP addresses to names. Find Mail servers. Authentication. Validate SPF andDMARC=BESTGUESSPASS
Looking at the headers within the mail received with my Office365 domain I see dmarc=bestguesspass. BestGuessPass? That’s a new. A few days after seeing dmarc=bestguesspass, Terry Zink at Microsoft posted an explanation.Exchange Online Protection, the filtering system for Office365, is analyzing the authentication of incoming emails and if the domain is not publishing a AUTHENTICATING WITH SPF: -ALL OR ~ALL What is SPF? Sender policy framework (SPF, RFC 7208) is an authentication process that ties the 5321.from (also known as the mail from, envelope from or return path) to authorized sending IP addresses.This authorization is published in a TXT record in DNS. Receivers can check SPF at the beginning of a SMTP transaction, compare the 5321.from domain to the connecting IP address and SPF ?ALL | WORD TO THE WISE The most read post on the blog is Authenticating with SPF: -all or ~all.In fact, it’s in the top 5 posts every single day. We still get comments on it, too. Usually from folks who disagree with myrecommendations.
A BRIEF GUIDE TO SPAMTRAPS A brief guide to spamtraps. “I thought spamtraps were addresses harvested off webpages.”. “I thought spamtraps were addresses that were valid and now aren’t.”. “I thought spamtraps were addresses created to catch spammers.”. There is a lot of “I thought” about spamtraps. Most of the theories are accurate but limited. DKIM - WORD TO THE WISE DKIM Domain Keys Identified Mail. DKIM. Check a DKIM key record. Keyrecord.
ALICE AND BOB SIGN MESSAGES Alice and Bob can send messages privately via a nosy postman, but how does Bob know that a message he receives is really from Alice, rather than from the postman pretending to be Alice? If they’re using symmetric-key encryption, and Bob is sure that he was talking to Alice when they exchanged keys, then he already knows that the mail is from Alice – as only he and Alice have the keys that DMARC - WORD TO THE WISE Field Value; v (Version): DMARC1 p (Requested Mail Receiver Policy): none sp (Subdomain Policy): quarantine rua (Aggregate Feedback Report Destinations): mailto:mailauth-reports@google.com Email reports to mailauth-reports@google.com ()DMARC P=REJECT
DMARC p=reject. March 30, 2016 by steve in Technical. Mail.ru is switching to p=reject. This means that you should special-case mail.ru wherever . Actually, no. Time to change that script. If you operate an ESP or develop mailing list software you should be checking whether the email address that is being used in the From: address of emailSPF: HOTMAIL.COM
SPF. This seems to be a healthy SPF record. This SPF record has 7/10 terms that cause DNS queries. This is an approximate list of the IP addresses that the domain hotmail.com allows email to be sent from according to their SPF record. WISETOOLS - WORD TO THE WISE wiseTools. Useful tools for email people. DNS. Convert Names to IP addresses. Convert IP addresses to names. Find Mail servers. Authentication. Validate SPF andDMARC=BESTGUESSPASS
Looking at the headers within the mail received with my Office365 domain I see dmarc=bestguesspass. BestGuessPass? That’s a new. A few days after seeing dmarc=bestguesspass, Terry Zink at Microsoft posted an explanation.Exchange Online Protection, the filtering system for Office365, is analyzing the authentication of incoming emails and if the domain is not publishing a AUTHENTICATING WITH SPF: -ALL OR ~ALL What is SPF? Sender policy framework (SPF, RFC 7208) is an authentication process that ties the 5321.from (also known as the mail from, envelope from or return path) to authorized sending IP addresses.This authorization is published in a TXT record in DNS. Receivers can check SPF at the beginning of a SMTP transaction, compare the 5321.from domain to the connecting IP address and SPF ?ALL | WORD TO THE WISE The most read post on the blog is Authenticating with SPF: -all or ~all.In fact, it’s in the top 5 posts every single day. We still get comments on it, too. Usually from folks who disagree with myrecommendations.
A BRIEF GUIDE TO SPAMTRAPS A brief guide to spamtraps. “I thought spamtraps were addresses harvested off webpages.”. “I thought spamtraps were addresses that were valid and now aren’t.”. “I thought spamtraps were addresses created to catch spammers.”. There is a lot of “I thought” about spamtraps. Most of the theories are accurate but limited. DKIM - WORD TO THE WISE DKIM Domain Keys Identified Mail. DKIM. Check a DKIM key record. Keyrecord.
ALICE AND BOB SIGN MESSAGES Alice and Bob can send messages privately via a nosy postman, but how does Bob know that a message he receives is really from Alice, rather than from the postman pretending to be Alice? If they’re using symmetric-key encryption, and Bob is sure that he was talking to Alice when they exchanged keys, then he already knows that the mail is from Alice – as only he and Alice have the keys that DMARC - WORD TO THE WISE Field Value; v (Version): DMARC1 p (Requested Mail Receiver Policy): none sp (Subdomain Policy): quarantine rua (Aggregate Feedback Report Destinations): mailto:mailauth-reports@google.com Email reports to mailauth-reports@google.com ()DMARC P=REJECT
DMARC p=reject. March 30, 2016 by steve in Technical. Mail.ru is switching to p=reject. This means that you should special-case mail.ru wherever . Actually, no. Time to change that script. If you operate an ESP or develop mailing list software you should be checking whether the email address that is being used in the From: address of emailSPF: HOTMAIL.COM
SPF. This seems to be a healthy SPF record. This SPF record has 7/10 terms that cause DNS queries. This is an approximate list of the IP addresses that the domain hotmail.com allows email to be sent from according to their SPF record. WISETOOLS - WORD TO THE WISE wiseTools. Useful tools for email people. DNS. Convert Names to IP addresses. Convert IP addresses to names. Find Mail servers. Authentication. Validate SPF and A BRIEF GUIDE TO SPAMTRAPS A brief guide to spamtraps. “I thought spamtraps were addresses harvested off webpages.”. “I thought spamtraps were addresses that were valid and now aren’t.”. “I thought spamtraps were addresses created to catch spammers.”. There is a lot of “I thought” about spamtraps. Most of the theories are accurate but limited.IMPLIED PERMISSION
Implied permission. Codified into law in CASL, implied permission describes the situation where a company can legally mail someone. The law includes caveats and restrictions about when this is a legitimate assumption on the part of the company. It is, in fact, a kludge. There isn’t such a thing as implied permission. ALICE AND BOB SIGN MESSAGES Alice and Bob can send messages privately via a nosy postman, but how does Bob know that a message he receives is really from Alice, rather than from the postman pretending to be Alice? If they’re using symmetric-key encryption, and Bob is sure that he was talking to Alice when they exchanged keys, then he already knows that the mail is from Alice – as only he and Alice have the keys that SHOULD YOU PUBLISH DMARC? This lets you publish a DNS record where you can receive reports about authentication failures. DMARC policy. This lets you publish a DNS record that asks receivers how to deliver mail (or not deliver mail) when authentication fails. v=DMARC1 is the version indicator. rua=mailto:postmaster@dmarc.example.com – asks for failure reportsto be
SHARING ACCESS TO GOOGLE POSTMASTER TOOLS As a delivery consultant, I always ask clients to share their Google postmaster reports with me. As Gmail is one of the bigger delivery challenges for a lot of senders,DKIM REPLAY ATTACKS
Replay attacks on DKIM signed messages. When you receive an email validly signed with DKIM by example.com that might not mean that example.com sent the email to you, or that they even sent this email at all. What it does tell you is that at some point in the past, example.com signed an email with exactly the same headers and body andsent it to
WHAT’S A SUSPICIOUS DOMAIN? It’s not just the mail the domain is present in. There are other things that lead to suspicion for domains, too. Domain . is located on a network with a bad reputation. is newly registered. has network connections to bad domains (like nameservers, etc) is a cousin domain to some regular domain. has a name pattern like snowshoers use.AUTHENTICATION
DMARC Domain-based Message Authentication, Reporting and Conformance. Check a DMARC policy. Policy record. SPF - WORD TO THE WISE SPF Sender Policy Framework. SPF. Check a published SPF record. Domain name. Minimize a published SPF record. SPF hostname. WISETOOLS - WORD TO THE WISE wiseTools. Useful tools for email people. DNS. Convert Names to IP addresses. Convert IP addresses to names. Find Mail servers. Authentication. Validate SPF andDMARC=BESTGUESSPASS
Looking at the headers within the mail received with my Office365 domain I see dmarc=bestguesspass. BestGuessPass? That’s a new. A few days after seeing dmarc=bestguesspass, Terry Zink at Microsoft posted an explanation.Exchange Online Protection, the filtering system for Office365, is analyzing the authentication of incoming emails and if the domain is not publishing a SPF ?ALL | WORD TO THE WISE The most read post on the blog is Authenticating with SPF: -all or ~all.In fact, it’s in the top 5 posts every single day. We still get comments on it, too. Usually from folks who disagree with myrecommendations.
AUTHENTICATING WITH SPF: -ALL OR ~ALL What is SPF? Sender policy framework (SPF, RFC 7208) is an authentication process that ties the 5321.from (also known as the mail from, envelope from or return path) to authorized sending IP addresses.This authorization is published in a TXT record in DNS. Receivers can check SPF at the beginning of a SMTP transaction, compare the 5321.from domain to the connecting IP address and GRADUAL DMARC ROLLOUT So I could start rolling out DMARC like this: “ p=none “: I don’t want any DMARC enforced, but I’d like reports on every mail that isn’t authenticated. “ p=quarantine; pct=5 “: I still want reports, and I’d like about 5% of non-authenticated mail to be quarantined. See if anyone complains. “ A BRIEF GUIDE TO SPAMTRAPS A brief guide to spamtraps. “I thought spamtraps were addresses harvested off webpages.”. “I thought spamtraps were addresses that were valid and now aren’t.”. “I thought spamtraps were addresses created to catch spammers.”. There is a lot of “I thought” about spamtraps. Most of the theories are accurate but limited. DKIM - WORD TO THE WISE DKIM Domain Keys Identified Mail. DKIM. Check a DKIM key record. Keyrecord.
ALICE AND BOB SIGN MESSAGES Alice and Bob can send messages privately via a nosy postman, but how does Bob know that a message he receives is really from Alice, rather than from the postman pretending to be Alice? If they’re using symmetric-key encryption, and Bob is sure that he was talking to Alice when they exchanged keys, then he already knows that the mail is from Alice – as only he and Alice have the keys that DMARC - WORD TO THE WISE Field Value; v (Version): DMARC1 p (Requested Mail Receiver Policy): none sp (Subdomain Policy): quarantine rua (Aggregate Feedback Report Destinations): mailto:mailauth-reports@google.com Email reports to mailauth-reports@google.com ()DMARC P=REJECT
DMARC p=reject. March 30, 2016 by steve in Technical. Mail.ru is switching to p=reject. This means that you should special-case mail.ru wherever . Actually, no. Time to change that script. If you operate an ESP or develop mailing list software you should be checking whether the email address that is being used in the From: address of email WISETOOLS - WORD TO THE WISE wiseTools. Useful tools for email people. DNS. Convert Names to IP addresses. Convert IP addresses to names. Find Mail servers. Authentication. Validate SPF andDMARC=BESTGUESSPASS
Looking at the headers within the mail received with my Office365 domain I see dmarc=bestguesspass. BestGuessPass? That’s a new. A few days after seeing dmarc=bestguesspass, Terry Zink at Microsoft posted an explanation.Exchange Online Protection, the filtering system for Office365, is analyzing the authentication of incoming emails and if the domain is not publishing a AUTHENTICATING WITH SPF: -ALL OR ~ALL What is SPF? Sender policy framework (SPF, RFC 7208) is an authentication process that ties the 5321.from (also known as the mail from, envelope from or return path) to authorized sending IP addresses.This authorization is published in a TXT record in DNS. Receivers can check SPF at the beginning of a SMTP transaction, compare the 5321.from domain to the connecting IP address and SPF ?ALL | WORD TO THE WISE The most read post on the blog is Authenticating with SPF: -all or ~all.In fact, it’s in the top 5 posts every single day. We still get comments on it, too. Usually from folks who disagree with myrecommendations.
A BRIEF GUIDE TO SPAMTRAPS A brief guide to spamtraps. “I thought spamtraps were addresses harvested off webpages.”. “I thought spamtraps were addresses that were valid and now aren’t.”. “I thought spamtraps were addresses created to catch spammers.”. There is a lot of “I thought” about spamtraps. Most of the theories are accurate but limited. DKIM - WORD TO THE WISE DKIM Domain Keys Identified Mail. DKIM. Check a DKIM key record. Keyrecord.
ALICE AND BOB SIGN MESSAGES Alice and Bob can send messages privately via a nosy postman, but how does Bob know that a message he receives is really from Alice, rather than from the postman pretending to be Alice? If they’re using symmetric-key encryption, and Bob is sure that he was talking to Alice when they exchanged keys, then he already knows that the mail is from Alice – as only he and Alice have the keys that DMARC - WORD TO THE WISE Field Value; v (Version): DMARC1 p (Requested Mail Receiver Policy): none sp (Subdomain Policy): quarantine rua (Aggregate Feedback Report Destinations): mailto:mailauth-reports@google.com Email reports to mailauth-reports@google.com ()DMARC P=REJECT
DMARC p=reject. March 30, 2016 by steve in Technical. Mail.ru is switching to p=reject. This means that you should special-case mail.ru wherever . Actually, no. Time to change that script. If you operate an ESP or develop mailing list software you should be checking whether the email address that is being used in the From: address of emailSPF: HOTMAIL.COM
SPF. This seems to be a healthy SPF record. This SPF record has 7/10 terms that cause DNS queries. This is an approximate list of the IP addresses that the domain hotmail.com allows email to be sent from according to their SPF record. WISETOOLS - WORD TO THE WISE wiseTools. Useful tools for email people. DNS. Convert Names to IP addresses. Convert IP addresses to names. Find Mail servers. Authentication. Validate SPF and A BRIEF GUIDE TO SPAMTRAPS A brief guide to spamtraps. “I thought spamtraps were addresses harvested off webpages.”. “I thought spamtraps were addresses that were valid and now aren’t.”. “I thought spamtraps were addresses created to catch spammers.”. There is a lot of “I thought” about spamtraps. Most of the theories are accurate but limited.IMPLIED PERMISSION
Implied permission. Codified into law in CASL, implied permission describes the situation where a company can legally mail someone. The law includes caveats and restrictions about when this is a legitimate assumption on the part of the company. It is, in fact, a kludge. There isn’t such a thing as implied permission. ALICE AND BOB SIGN MESSAGES Alice and Bob can send messages privately via a nosy postman, but how does Bob know that a message he receives is really from Alice, rather than from the postman pretending to be Alice? If they’re using symmetric-key encryption, and Bob is sure that he was talking to Alice when they exchanged keys, then he already knows that the mail is from Alice – as only he and Alice have the keys that SHOULD YOU PUBLISH DMARC? This lets you publish a DNS record where you can receive reports about authentication failures. DMARC policy. This lets you publish a DNS record that asks receivers how to deliver mail (or not deliver mail) when authentication fails. v=DMARC1 is the version indicator. rua=mailto:postmaster@dmarc.example.com – asks for failure reportsto be
SHARING ACCESS TO GOOGLE POSTMASTER TOOLS As a delivery consultant, I always ask clients to share their Google postmaster reports with me. As Gmail is one of the bigger delivery challenges for a lot of senders,DKIM REPLAY ATTACKS
Replay attacks on DKIM signed messages. When you receive an email validly signed with DKIM by example.com that might not mean that example.com sent the email to you, or that they even sent this email at all. What it does tell you is that at some point in the past, example.com signed an email with exactly the same headers and body andsent it to
WHAT’S A SUSPICIOUS DOMAIN? It’s not just the mail the domain is present in. There are other things that lead to suspicion for domains, too. Domain . is located on a network with a bad reputation. is newly registered. has network connections to bad domains (like nameservers, etc) is a cousin domain to some regular domain. has a name pattern like snowshoers use.AUTHENTICATION
DMARC Domain-based Message Authentication, Reporting and Conformance. Check a DMARC policy. Policy record. SPF - WORD TO THE WISE SPF Sender Policy Framework. SPF. Check a published SPF record. Domain name. Minimize a published SPF record. SPF hostname. Having an email crisis? email us or 800 823-9674Open Menu
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