Glossary
MUA
Mail User Agent: the program a person uses to read and write email, such as a mail app.
ValidReach Team · Updated 2026-10-26
In practice
It talks to the mail server over IMAP or POP3 to fetch mail and over SMTP to send it. The MUA is the client; the server behind it is the MTA.
Verification and sending
Not related to verification, which concerns the server side.