Real SMTP verification, no guesswork
Bouncebuster checks each address the way a mail server would — but without ever delivering a message. Here’s the full pipeline.
Syntax & normalization
We normalize the address and reject malformed syntax up front, following the same rules mail servers use.
MX lookup
We resolve the domain’s mail exchangers. No mail servers means mail can’t be delivered — the address is invalid.
Live SMTP probe
From dedicated, reputation-managed IPs we open an SMTP conversation and ask whether the mailbox exists — without ever sending an email.
Catch-all detection
We probe a random address on the domain. If the server accepts anything, we mark the domain catch-all so you aren’t misled.
Disposable & role checks
We flag throwaway/disposable providers and role-based mailboxes (info@, support@) so you can decide what to keep.
What you get back
The mailbox exists and accepts mail. Safe to send.
Bad syntax, no mail server, or the mailbox does not exist. Remove these.
The domain accepts everything, so we cannot confirm the individual mailbox.
Temporary / throwaway inboxes. Usually worth removing.
The server wouldn't give a clear answer. Never charged to your account.