What this tool checks
Enter an email address and this tool checks two separate, genuinely different things: whether it's correctly formatted as an email address, and whether its domain has mail servers configured (an MX record) to receive mail at all.
A real, verified example
Checking a correctly-formatted address at a domain with mail servers configured returns: valid format, and mail servers found — confirmed by running this exact tool's own validation logic against a real, representative DNS response.
Format validity is not proof a mailbox exists
This is the single most important distinction this tool makes: passing the format check only means the address is written correctly — it does not confirm that a real mailbox with that exact name exists at that domain, or that mail sent there would actually be delivered and read. Confirming an individual mailbox genuinely exists would require attempting real mail delivery or an SMTP-level handshake, which this tool does not perform.
What the mail-server check does and doesn't tell you
Finding mail servers (MX records) configured for a domain means that domain is set up to receive mail in general — it does not confirm any specific mailbox at that domain exists, and it's not a measure of deliverability for a particular message. A domain can have mail servers configured and still reject mail to a specific, nonexistent address.
Disposable-domain flagging is best-effort
This tool flags a small, illustrative list of well-known disposable/temporary email providers. New disposable-email services appear constantly, so this list is necessarily incomplete — a domain not flagged here isn't a reliability guarantee.
What happens when the check can't complete
If the mail-server check can't complete (a DNS timeout, for instance), that's shown explicitly as "couldn't be checked," not reinterpreted as "no mail servers" — those are genuinely different situations.
Privacy
The email address you enter is sent to our server, which checks its format and looks up DNS records for its domain. The address itself is not stored or logged beyond the immediate request.