From The Free On-line Dictionary of Computing (19 January 2023): TURN <messaging, protocol> An SMTP command with which a client asks the server to open an SMTP connection to the client, thus reversing their roles. Superseded by ETRN. (1997-11-21)
TURN
<messaging, protocol> An SMTP command with which a client asks the server to open an SMTP connection to the client, thus reversing their roles.
Superseded by ETRN.
(1997-11-21)
