Resources
Email verification guides
Plain-language guides for cleaning lists, understanding results, and sending with less risk.
How to clean an email list before sending.
To clean an email list, export it, verify every address, remove Failed results, review Unknown ones, and re-import only the addresses you trust.
Read guideEmail verification before a campaign: a pre-send checklist.
Verify your list a few days before a campaign, remove Failed addresses, send to Unknown results in smaller batches, and watch bounce rates after the send.
Read guidePassed, Failed, and Unknown email verification results explained.
Passed means the address looks deliverable, Failed means it's invalid or rejects mail, and Unknown means the receiving server didn't give a clear answer.
Read guideHow to handle catch-all email addresses in your list.
Segment catch-all addresses, keep the ones from trusted sources, send to them in small batches, and remove any that bounce.
Read guideDisposable email addresses: risks and cleanup.
Disposable emails come from temporary inbox services. Flag them during verification and remove them from marketing lists.
Read guideEmail list cleaning for agencies.
Agencies should verify every client list at intake, share a simple Passed/Failed/Unknown summary, and launch only with the cleaned export.
Read guidePay-as-you-go email verification explained.
Pay-as-you-go email verification means buying credits once and spending them only when you verify, with no recurring bill.
Read guide
Looking for definitions? See the email verification glossary.