.\"	@(MHWARNING)
.\" @(#)$Id$
.SC POPD 8
.NA
popd \- the POP server
.SY
/usr/etc/popd
\%[\-p\ portno]
(under /etc/rc.local)
.DE
The \fIpopd\fR server implements the Post Office Protocol (version 3),
as described in RFC1081 and RFC1082.
Basically, the server listens on the TCP port named \*(lqpop\*(rq
for connections and enters the
POP upon establishing a connection.
The `\-p' option overrides the default TCP port.
.PP
If the POP2 configuration option is defined,
then the server also implements version 2 of the protocol.
.PP
If the APOP configuration option is defined,
then the server supports a non-standard mechanism for identity-establishment
in which authentication credentials are used to provide for origin
authentication and reply protection,
but which do not involve sending a password in the clear over the network.
See \fIpopauth\fR(8) for more details.
.Fi
^/usr/spool/pop/POP~^POP database
.Pr
None
.Sa
\fIPost Office Protocol - version 3\fR (aka RFC\-1081),
.br
\fIPost Office Protocol - version 3: Extended service offerings\fP
(RFC\-1082),
.br
pop(5)
.De
None
.Co
None
.Hi
For historical reasons, the \fIMH\fP POP defaults to using
the port named \*(lqpop\*(rq (109) instead of its newly assigned
port named \*(lqpop3\*(rq (110).
See the POPSERVICE configuration option for more details.
.sp 
Previous versions of the server (10/28/84) had the restriction that
the POP client may retrieve messages for login users only.
This restriction has been lifted,
and true POB support is available
(sending mail to a mailbox on the POP service host
which does not map to a user\-id in the password file).
.En