SimpleVerifier Team · Reviewed
Should I delete invalid emails or keep them?
Remove invalid addresses from every sending list, but keep them on a suppression list instead of deleting the records. If they are deleted outright, the same address often returns on the next import and you bounce again. Suppression keeps the history and stops the repeat.
What to do with each result
Keep one suppression list for the whole business, shared by every tool that sends mail.
- Invalid (the server says the mailbox does not exist): suppress permanently.
- Risky (unconfirmed): do not delete; segment and test in a small batch.
- Valid: send, and re-verify when the result is more than a few months old.
Why not delete
A suppression entry is also your record that an address was checked, which protects you if a list is merged later from an old export.
Related questions
- Can I re-import an invalid address later?
- Only after re-verifying it. People do get new mailboxes, but a previously invalid address should be treated as invalid until a fresh check says otherwise.
Sources
- Mailchimp: about cleaned contacts
- Bounce limits by platform, read from each vendor's own docs (SimpleVerifier, 1 Oct 2026)
Figures marked as ours come from SimpleVerifier’s own dated tests on made-up addresses, published with their data on the research page. No customer data is used, and we publish no accuracy percentage because we have no independent measurement to back one.
Do it now
Test it on a real address first
Type any address. It gets the same check the paid plans run: syntax, the domain’s mail servers and, where the provider allows it, a live mailbox check. Nothing is sent to the address.
Five checks a minute, no account needed. Nothing is sent to the address — we ask its mail server whether the mailbox exists, then disconnect.
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