MX Records Explained: How Our Validator Catches Fake Emails

Most simple email checkers only look at the format - does it have an @ sign, a domain, a dot, and a couple of letters at the end? That catches obvious typos, but it misses a huge category of bad addresses: ones that are formatted perfectly but point to a domain that can't receive email at all.

That's where MX records come in. An MX (Mail Exchange) record is what tells the internet which mail server is responsible for a domain's incoming email. If a domain has no MX record, no email sent to it will ever arrive - no matter how correctly it's formatted.

Our Email Validator checks the MX record for every domain in your list, in addition to the format check. That combination catches both obvious typos and the sneakier problem of dead or misconfigured domains - giving you a genuinely reliable picture of which addresses are worth keeping.