Deliverability
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FAQ: The Universal Feedback Loop (uFBL)
How do I get a login for the uFBL? New subscribers should navigate to the Universal Feedback Loop...
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What is domain warming and why do you need to do it?
Domain warming is the way you establish a sending reputation for a new domain, or a domain that h...
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Troubleshooting filtered messages
Filtered rate means the message was accepted at the gateway but then bulked or was dropped due to...
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Troubleshooting rejected sender
Rejected rate means the message was not accepted (blocked) due to reputation drivers such as end ...
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Troubleshooting volume
What can I do to fix my points lost due to a volume spike? The two most important factors that...
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Troubleshooting infrastructure
What can I do to fix rDNS? If you're failing this test, your system administrator will need to up...
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Troubleshooting complaints
What can I do to reduce complaints now? Sign up or verify you are signed up for all mailbox prov...
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Troubleshooting unknown users
What can I do to reduce unknown user rate now? Review your infrastructure to make sure you are s...
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Troubleshooting blocklist issues
What can I do about a blocklist listing now? IPs are most commonly listed on blocklists because ...
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Troubleshooting spam traps
What can I do to reduce spam traps now? Establish an on-going process for actively removing subs...
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List of all available complaint feedback loops (FBLs)
Enrolling in feedback loops (FBLs) is an important deliverability best practice, allowing you the...
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What is a Cloudmark fingerprint and how does it work?
Cloudmark is a messaging security and anti-spam company owned by Proofpoint. Through their Global...
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How to identify a Cloudmark spammy fingerprint in Everest
Content containing a Cloudmark spammy fingerprint is usually sent to the spam folder or blocked b...
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What should I do if my content has a Cloudmark spammy fingerprint?
If you don't know if your content has a Cloudmark spammy fingerprint, follow the steps listed her...
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How to warm up an IP address
Mailbox providers are cautious about the email activity from new IP addresses. Spammers frequentl...
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How to warm up a domain
Marketers change sending domains for a variety of reasons, including: A brand change A corporate...
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ESP Moving Guide
Switching ESPs is a huge undertaking with impacts across your email program.Validity is here to h...
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Changing ESPs? Follow these steps to help make the transition go smoothly
If you are only considering changing ESPs or if you have already made the decision to move to a n...
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Is there a difference in deliverability performance between an HTML and text-based email?
Deliverability performance is not determined by the message type: an HTML coded email versus a te...
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How to send to dormant subscribers
How to send email to dormant subscribers is a common question we get from marketers. A general gu...
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Does using ‘noreply’ in my sending or reply-to address harm deliverability?
Mailbox providers don’t have filtering rules set up to place your email into the spam folder if ‘...
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Best practices for increasing sending volume
Increasing volume in your email program usually involves: A temporary increase for a special ev...
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Tips for sending to appended email addresses
Sending to email addresses acquired through an email appending list service is not recommended be...
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Video in Email: Strategy and Planning
Using video in your email can be an effective way to engage your prospects and customers. Prior t...
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Video in Email: Best Practices
Using video in your email can be an effective way to engage your prospects and customers. While f...
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Why are my inbox placement rates different between mailbox providers?
Mailbox providers use hundreds of data points regarding your email program to make decisions abou...
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IP segmentation best practices
IP segmentation is a popular best practice recommended by many mailbox providers to help improve ...
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Using IP segmentation to improve deliverability
Segmenting your IP addresses is the process of separating and sending email traffic from differen...
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How to perform an A/B split test with the Everest Seed List
A/B split testing is a method of comparing two versions of a single email campaign to determine w...
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Tips for sending to an old email list
There are times when you may be tempted (or legally required) to mail to an old email list. It is...