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2 definitions found
 for SMTP
From V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016) :

         Simple Mail Transfer Protocol (RFC 821, TCP/IP)

From The Free On-line Dictionary of Computing (30 December 2018) :

  Simple Mail Transfer Protocol
      (SMTP) A protocol defined in STD 10, RFC
     821, used to transfer electronic mail between computers,
     usually over Ethernet.  It is a server to server protocol,
     so other protocols are used to access the messages.  The SMTP
     dialog usually happens in the background under the control of
     the message transfer agent, e.g. sendmail but it is
     possible to interact with an SMTP server using telnet to
     connect to the normal SMTP port, 25.  E.g.
     	telnet mhs-relay.ac.uk 25
     You should normally start by identifying the local host:
     	HELO wombat.doc.ic.ac.uk
     You can then issue commands to verify an address or expand an
     	VRFY fred@doc.ic.ac.uk
     	VRFY postmaster
     or expand a mailing list:
     	EXPN c-help
     You can even send a message:
     	MAIL From:
     	RCPT To:
     	What is the point?
     This is useful if you want to find out exactly what is
     happening to your message at a certain point.
     See also Post Office Protocol, RFC 822, sendmail.

Contact=webmaster@dict.org Specification=RFC 2229