messaging, protocol ("Extended
TURN") An
ESMTP command (first defined in RFC 1985) with which a
client asks the
server to deliver queued mail to the client via a new ESMTP connection.
ETRN supersedes the
SMTP "TURN" command in the same way that ESMTP's "EHLO" supersedes SMTP's "
HELO".
(1997-11-21)