Email Validator Tools

A bad email list costs you twice: once in the bounce rate that drags your sending reputation down, and again in the money a validation service charges per address to tell you so. These tools do the part that needs no mail server at all — and that part catches most of the bad addresses.

Validate one address or paste a hundred thousand: every one is checked against RFC 5321 and 5322 syntax, the 64-character local part and 254-character total limits, and the shape of a real domain. On top of that sits the risk read — known disposable and throwaway domains, role accounts like info@ and admin@ that no individual reads, free providers against real business domains, likely spam traps, and the typos that make up a surprising share of every signup list (gmial.com, yahooo.com, hotnail.com), each with the domain it was meant to be.

Then the list work: strip duplicates including the ones Gmail treats as the same mailbox, normalise sub-addresses and casing, compare a list against a suppression list, split a big file into import-sized chunks, validate an email column straight out of a CSV, and get a quality report on the whole list before you load it anywhere.

There are checkers for the records behind deliverability too — SPF, DKIM and DMARC syntax, raw message headers and SMTP bounce codes — so you can tell a hard bounce from a soft one, and a broken policy from a working one.

Every one of them runs inside your own browser. A customer list is personal data, and handing one to a stranger to be checked is the part of email validation nobody likes — so here it is never uploaded, which is also why there is no per-address price and no row limit.