Email Address Validator

Validate email addresses free online with real DNS MX record lookup, not just format checking. Confirms the domain can actually receive mail, using free Google DNS.

How to Use This Tool

Enter an email addressAdd the address you want to validate

Click ValidateFormat is checked, then a real DNS MX lookup runs

Read the resultSee if the domain is actually configured to receive mail

Email Address Validator is a free online tool that works entirely in your browser — no signup, no data uploaded, no limits.

Format-Valid and Deliverable Are Two Different Things

"contact@my-totally-real-company.xyz" can pass every regex format check while pointing to a domain that has never been configured to receive any email at all. Pure format validation, while necessary, misses an entire category of invalid addresses -- domains that don't exist, domains that exist but have no mail server, or simple typos in the domain portion.

This tool adds a real DNS MX record check using Google's free public DNS-over-HTTPS API, confirming the domain genuinely has mail exchange servers configured before considering the address potentially valid.

Why Full Mailbox Verification Isn't Attempted

True confirmation that a specific mailbox exists would require an SMTP-level handshake with the destination mail server, asking it to confirm the recipient without actually sending mail. Most mail providers deliberately respond ambiguously to this kind of probe now, specifically because spammers used it to harvest valid address lists -- so attempting it reliably no longer works in practice, even for legitimate validation purposes.

What MX Presence Actually Tells You

An MX record confirms the domain has designated mail servers and is at least theoretically capable of receiving email. It does not confirm a specific mailbox exists, isn't full, or will actually accept a given message -- but catching domains with no mail capability at all removes a meaningful source of guaranteed bounces before you ever attempt to send.

Frequently Asked Questions

Most validators only check format -- does it look like name@domain.com. This tool adds a real DNS MX record lookup using Google's free DNS-over-HTTPS API, confirming the domain actually has mail servers configured to receive email. A perfectly formatted address at a domain with no mail server will still bounce, which format checking alone cannot catch.

No. Confirming a specific mailbox exists would require an SMTP-level verification handshake with the receiving mail server, which most mail servers deliberately don't respond to reliably anymore due to spam-harvesting concerns. This tool confirms the domain is configured to receive mail, which catches a meaningful category of invalid addresses without that more invasive check.

Common reasons: a typo in the domain itself, a domain that was once active but has expired or been abandoned, or a domain that genuinely was never set up to receive email at all (some domains exist only to host a website with no associated mailboxes).

It confirms the domain can theoretically receive mail, but says nothing about whether that specific mailbox exists, is full, or is otherwise unreachable. MX presence is necessary but not sufficient for a successful delivery.

Only the domain portion (after the @) is sent to Google's DNS resolver, not the full email address or any personal information -- the same exposure as visiting any website hosted on that domain.