Free tool
Bulk email verifier
Clean an entire email list before your next campaign. Paste addresses or drop a CSV and the verifier checks syntax, TLD, DNS/MX, SPF/DMARC, disposable domains, role accounts and mailbox provider — all free, no API key required.
Import any CSV
Drop a CSV with any column layout. The tool finds the email column automatically and de-duplicates the list before validating.
Every free check runs
RFC syntax, IANA TLD, DNS/MX, parked/null-MX, SPF/DMARC, disposable domains, role accounts, typo suggestions and provider classification.
Export clean groups
Download the full result set as a CSV, or export only the addresses grouped by mailbox provider, business vs free mailbox, or company category.
Ready to verify mailbox deliverability?
After the free layer removes dead addresses, run the SMTP debouncer to confirm which mailboxes actually accept mail. One credit verifies one address.
Open the debouncerBulk email verifier FAQ
How bulk verification works, what it exports and how it keeps your list clean.