Email verification vs validation

People use “validation” for a regex or HTML5 email field. That only asks whether the string looks like an address.

Verification asks the mail system. NexiphorVerifier still rejects malformed syntax (including Unicode local parts on live keys), then looks up MX records and probes SMTP.

Why the distinction matters on a list

A syntactically valid catch-all address will pass a format validator and still bounce later. List validation on NexiphorVerifier means classifying the row after the probe, then exporting what you are willing to send.

Workflow: email list validation.