What is email verification?

Email verification is a check that an address can receive mail — not that someone will open it, and not that it is a good lead.

NexiphorVerifier verifies by combining syntax and domain checks with an SMTP mailbox probe (RCPT TO against the receiving MX). It does not send a message to the inbox.

What you get back

Every completed check is one of four statuses: Valid, Invalid, Risky, or Unknown. Catch-alls are not painted Valid. Unknown means the probe could not finish and is refunded.

To run this from code, see the email verification API and /docs.