Email Verifier

First the address itself: the format, whether it is a team mailbox such as info@, whether it looks made up, and whether it belongs to a temporary inbox or a free email provider. Then the domain's MX records, which say where its email goes. When the mailbox check is on, we also connect to that mail server and ask whether it will accept email for this address, and we stop before anything is sent. When it is off, the result says Mailbox not checked.

Valid: the mail server confirmed the mailbox. Invalid: the address cannot receive email. Accept-all: the server says yes to every address at that domain, so we cannot confirm this one. Unknown: the server would not give a clear answer. Risky: a temporary inbox that may stop working.

A valid address starts at 95, accept-all at 60, mailbox not checked at 50, unknown at 40 (35 when the server blocked our check), a temporary inbox at 20 and an invalid address at 0. A team mailbox takes off 10 and an address that looks made up takes off 15. A valid address never goes below 70.

Gmail, Microsoft 365, Outlook, Yahoo and AOL protect their users by giving every outside checker the same answer, so no tool can truly confirm one of their mailboxes. We check everything else and say so plainly. Mailbox not checked does not mean the address is bad.

No check can promise an email will be delivered. A mailbox can be full, switched off later, or filter your message. A valid result means the mail server accepted the address when we asked.

We use it only to run the check. We do not store it, and it is never put in the page address, so it does not end up in your browser history.