SMTP

SMTP

Simple Mail Transfer Protocol. A protocol for sending (or relaying) e-mail to a server.

See also: IMAP, POP, MX Record.

For more information see:

• www.ietf.org/rfc/rfc0821.txt - RFC 821 defines SMTP.
• www.greenend.org.uk/rjk/2000/05/21/smtp-replies.html - SMTP reply codes.