Free tool
Email list cleaning
Dirty lists kill deliverability. Paste addresses or upload a CSV and DebounceNow removes the syntax errors, dead domains, disposable mailboxes, role accounts and duplicates before you send — free, unlimited and no API key.
Remove the bad addresses first
Invalid TLDs, missing MX, parked domains, null MX, disposables and role accounts are flagged before they become hard bounces.
De-duplicate automatically
The tool finds the email column in any CSV and removes duplicates, so each address is checked and exported only once.
Export a clean list
Download the full results or only the clean addresses grouped by provider, business vs free mailbox, or company category.
Ready to verify the survivors?
After cleaning, run the SMTP debouncer on the remaining addresses to confirm each mailbox actually accepts mail.
Open the debouncerEmail list cleaning FAQ
How list cleaning works, what it removes and why it protects deliverability.