Lists decay
People change jobs and abandon inboxes, so a good list loses addresses every month.
Mailcleaner · List cleaning
Email list cleaning: upload a list, export only good addresses.
Upload a list, see exactly how clean it is, and export only the addresses worth sending to. A suppression list keeps bounced and complaining addresses out, and the reuse window means re-checking recent addresses costs nothing.
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mailcleaner.flaxxa.com / list-hygiene
contacts.csv
12,480 addresses · completed
Valid84%
Invalid9%
Risky4%
Catch-all2%
Disposable1%
1,123 invalid Export clean
- CSV, TSV, TXT, XLSX
- 25 MB
- Counts and filters
- Per verdict
- CSV or XLSX
- Export
- Recent re-checks
- Free
01 / 04
Why do email lists need cleaning?
Imports bring junk
Event lists, old CRMs and form exports carry typos and fakes.
Bad addresses come back
Remove an address once and it returns with the next CSV import.
02 / 04
How do you clean an email list with Flaxxa Mailcleaner?
Upload or import
Drop in a file, paste a list, import from Google Drive or pull from a connected email tool.
See the breakdown
Counts for each verdict, with filters by verdict, domain or address.
Export clean
Download the verdicts you choose as CSV or XLSX.
Keep them out
Add addresses to the suppression list so they're never checked or mailed again.
03 / 04
What does list cleaning include?
Bulk upload
CSV, TSV, TXT or XLSX up to 25 MB, plus paste and Google Drive.
Typo scan
Spots likely typos before the job starts, without spending credits.
Verdict breakdown
Counts per verdict, with filters by verdict, domain or address.
Clean export
CSV or XLSX, filtered by verdict, with the columns you choose.
Suppression list
A do-not-mail list with reasons, fed by bounces and complaints from Flaxxa email campaigns.
Reuse window
Recent final verdicts are reused free instead of checked again.
04 / 04
What changes with a clean list?
Better sends, without extra work.
Send to real people
Only addresses worth sending to make the export.
Bad addresses stay out
Suppressions stop them creeping back.
No paying twice
Recent verdicts are reused free.
Keep exploring
More Mailcleaner capabilities
Monitors
Re-verify a connected Mailchimp, Brevo, HubSpot or other list daily, weekly, monthly or quarterly, and optionally tag bad addresses back in the tool.
Email verification
Verify one email address or a whole list: a verdict, a 0–100 risk score and a confidence score for each, from a paste, a file, Google Drive or the API.
Catch-all detection
Find catch-all (accept-all) domains in your email list. Flaxxa Mailcleaner tests each server, scores catch-all domains and never passes them off as valid.
FAQ
List cleaning: common questions
Upload the list to Flaxxa Mailcleaner, let it verify every address, then export only the verdicts you want to send to, usually valid, with catch-all handled separately.
Get started in minutes
Try Flaxxa Mailcleaner free.
Spin up a workspace and put List cleaning through its paces.
Free plan · No credit card · Cancel anytime