Authentication and infrastructure
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Why should I rotate DKIM keys and how frequently should I rotate them?
Why should I rotate my DKIM keys? DKIM is a cryptographic protocol involving private and public ...
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Including domains in your SPF record
An SPF record is your way of telling mailbox providers which IP addresses or domains are authoriz...
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What is DMARC, who uses it, and do I need it?
What is DMARC? DMARC, also known as Domain-based Message Authentication, Reporting, and Conforman...
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How to set up reverse DNS zone and PTR records
As a preventative measure against bulking during email delivery, it is critical to ensure that re...
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What are the DMARC passing requirements?
To pass DMARC, your email must pass either or both of the following: SPF authentication and SPF ...
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How does Brand Indicators for Message Identification (BIMI) work for email?
The sender: Sets up DMARC authentication for their domain. Publishes their BIMI text record for ...
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What are the benefits of using Brand Indicators for Message Identification (BIMI) for email?
The benefits of using BIMI for email are: It is a single technology standard that works across a...
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Which mailbox providers support Brand Indicators for Message Identification (BIMI) and where is it supported?
The following mailbox providers currently support BIMI: Mailbox Provider VMC required Y...
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What does an email look like with and without using Brand Indicators for Message Identification (BIMI)?
Below are two examples of what an email looks like with and without using BIMI. Your subscriber's...
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How to implement Brand Indicators for Message Identification (BIMI) on my emails
Follow the steps below for your logo to display correctly at participating mailbox providers. For...
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What is the correct syntax for a Brand Indicators for Message Identification (BIMI) record in the Domain Name System (DNS)?
BIMI records are stored in the DNS as a TXT (text) record with the following syntax. For details ...
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Do I need to add a BIMI-Selector header to all of my emails?
Inserting a BIMI-Selector header is not required, but it is recommended. It gives you more flexib...
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What is the correct syntax for the BIMI-Selector header?
The BIMI-Selector header is inserted into all of your marketing emails and notifies participating...
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What are the different tags of the BIMI-Selector email header?
There are only two tags available for the BIMI-Selector email header. The BIMI-Selector header is...
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What are the different tags of a Brand Indicators for Message Identification (BIMI) assertion record?
There are only a few tags available for your domain's BIMI assertion record. The assertion record...
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What is the difference between self-assertion and a Verified Mark Certificate (VMC) issued by a Mark Verifying Authority (MVA)?
Any sender can self-assert BIMI by completing DMARC enforcement, uploading an SVG image, and publ...
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How to get a Verified Mark Certificate for BIMI
A Verified Mark Certificate is currently issued by the following certification authorities: Dig...
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How to group existing subscriptions in the Validity Universal Feedback Loop (uFBL)
The Universal Feedback Loop brings all Validity hosted feedback loops (FBLs) into one cohesive an...
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Connection and Throughput Guide (PDF)
One of the keys to effective deliverability is to ensure you are respecting the mailbox providers...
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Why is a subscriber ID needed for complaint processing?
When a subscriber marks your message as spam, the mailbox provider sends you back a message using...
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What is a subscriber ID for complaint processing and how do I implement one?
What is a subscriber ID? A subscriber ID is an alphanumeric identifier that corresponds to a spec...
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How to set up SPF
Sender Policy Framework (SPF) is an email authentication protocol that allows the owner of a doma...
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How to interpret SPF authentication verification results
Sender Policy Framework (SPF) authentication verification results should be returned back to the ...
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What are the different SPF record authorization types?
Sender Policy Framework (SPF) records use authorization type statements to tell mailbox providers...
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Why is Sender Policy Framework (SPF) not effective in blocking domain spoofing without the implementation of other authentication standards?
Sender Policy Framework (SPF) is an important authentication protocol used across the email indus...
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How can I avoid SPF failures if I am reaching the DNS lookup limit?
The SPF specification limits the number of DNS lookups to 10. This limit helps reduce the amount ...
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Troubleshooting SPF failures (with Kitterman's SPF Query tool)
One of the best tools for troubleshooting Sender Policy Framework (SPF) issues is available from ...
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Troubleshooting Sender Policy Framework (SPF) failures
This article was replaced by: Troubleshooting SPF failures (with Kitterman's SPF Query tool)
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Common SPF record syntax errors
You must follow the syntax outlined in the SPF specification for your SPF record to work properly...
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Do all domains need a Sender Policy Framework (SPF) record?
All domains, regardless if they send email, should include a Sender Policy Framework (SPF) record...