List Quality Check

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Why are your emails bouncing?

Diagnose the problem and spring into action with our email bounce lookup tool.

Find your bounce type by the entering keyword(s) or error code (e.g., 4.1.2) in the search bar, or browse the links below

What can I learn from Bounce Lookups?

When trying to keep your email bounce rate healthy, knowledge is power.

The bounce code your email generates will tell you if there’s an issue with your list, indicate if you’re on a blocklist, or alert you if there’s a problem at the mail server you’re trying to reach.

Our tool makes these code messages easier to understand and provides clearer remedies.
To get started, find your bounce code using our search box or our common email bounces list.

For each specific bounce code, you’ll find:

  • The official error definition—and the plain English version
  • Community feedback about the error
  • How to get more help with that specific bounce type

Learn how to improve your deliverability

You can always work to get into more of your subscribers’ inboxes.


Fundamentals of Email Deliverability


Breaking Down BIMI

Podcast Episode

What’s the Deal with Email Deliverability? (And Why Everyone Gets It Wrong)

Your assessment doesn’t stop here.

Evaluate the factors that could impact your ability to reach your subscribers’ inboxes.

Sender Score

The original. Monitor your sender reputation.

Deliverability Benchmarks

Compare your stats to the global email community.

List Quality Checks

Upload your list to see if your contacts are legit.

Keep your email list healthy

Mailing to an accurate and up-to-date contact list is essential to keeping a positive reputation and staying off blocklists. Learn more about Validity BriteVerify’s secure and scalable contact verification.