How to Bulk Verify an Email List for Free

A list collected over months or years - through signup forms, imports, and old exports - always has some mix of typos, closed inboxes, and disposable addresses buried in it, even if it looked fine when each address was added one at a time. Bulk verification runs the whole list through the same checks a single-address verifier uses, all at once, so the bad addresses are found before a campaign goes out rather than after it bounces.

Why a bad list is worse than a small list

A high bounce rate is one of the strongest negative signals a mailbox provider tracks against a sending domain, and it affects every email you send afterward - including the ones going to your genuinely good subscribers. Sending to a cleaned list of 2,000 real addresses beats sending to an unverified list of 5,000 where a fifth of them bounce.

Steps to verify a list

1. Export your list as a CSV with one email address per row.
2. Upload the file to the bulk verifier and start the check.
3. Each address is checked for valid syntax, real MX records, mailbox reachability, and disposable-domain status.
4. Download the results, split into valid, invalid, and risky/catch-all - and send only to the valid group for anything important.

How much is free

A limited number of bulk checks are included for free every day with no signup required, which is enough to clean a smaller list or spot-check a larger one. Premium removes the daily cap for verifying a whole list in one pass.