.TH POP3 8
.SH NAME
pop3, imap4d \- Internet mail servers
.SH SYNOPSIS
.PP
.B upas/pop3
[
.B -d
.I debugfile
][
.B -a
.I mailbox
][
.B -r
.I peeraddr
][
.B -t
.I tlscertfile
][
.B -p
]
.PP
.B ip/imap4d
.RB [ -acpv ]
.RB [ -d
.IR smtpdomain ]
.RB [ -s
.IR servername ]
.SH DESCRIPTION
These programs support remote access to mail across the Internet.
All expect the network connection to be standard input, output, and error.
They are normally started from scripts in
.B /rc/bin/service
(see
.IR listen (8)).
.PP
.I Pop3
provides access to a user's mailboxes via the POP3 protocol.
The options are:
.TP 4
.B -d
create
.I debugfile
and write debugging output to it
.TP
.B -a
causes pop3 to assume that it it already authenticated
and to read
.I mailbox
immediately
.TP
.B -r
causes
.I pop3
to create the file
.B /mail/ratify/trusted/\fIpeeraddr\fP#32
to allow subsequent SMTP sessions from that
address.  See
.IR ratfs (4)
for details.
.TP
.B -t
get the local TLS certificate from the file
.IR tlscertfile .
.TP
.B -p
allow passwords in the clear for authenticating the connection
.PP
.I Imap4d
provides access to a user's mailboxes via the IMAP4rev1 protocol.
Only files rooted in
.BI /mail/box/ username /
are accessible.
The list of subscribed mailboxes is contained in
.BI /mail/box/ username /imap.subscribed ,
and initially contains only
.BR INBOX ,
IMAP's name for the user's mailbox.
A shadow file,
.IB mailbox .imp ,
is created for each mailbox examined.
.PP
.IR Imap4d 's
options are:
.TP 4
.B a
Assume the user is already authenticated.
By default, the user must authenticate using
CRAM-MD5 or
.IR securenet (8)
challenge/response authentication.
.TP
.B c
Allow plan 9 challenge response authentication.
.TP
.B p
Allow login authentication.  This option
should only be enabled for servers using
an encrypted connection, such as SSL,
and when enabled, all non-encrypted connections should be disallowed.
.I Imap4d
does not enforce this policy.
.TP
.B v
Turn on verbose output to the debug file.
.TP
.B s
The server's name.
If none is provided,
.B cs
(see
.IR ndb (8))
is queried or
.B /env/sysname
is used.
.TP
.B d
The local mail domain.
Defaults to the server
.B /env/site
in the mail server's domain.
.PP
For both
.I imap4d
and
.IR pop3 ,
the password used to authenticate the connection is the APOP
secret held by
.IR keyfs (4)
running on the authentication server.
.SH FILES
.TF /mail/box/username/imap.subscrib
.TP
.B /sys/log/imap4d
debugging output
.TP
.BI /mail/box/ username / mailbox
.TP
.BI /mail/box/ username / mailbox .imp
.TP
.BI /mail/box/ username /imap.subscribed
.SH SOURCE
.B /sys/src/cmd/upas/pop3
.br
.B /sys/src/cmd/ip/imap4d
.SH "SEE ALSO"
.IR aliasmail (8),
.IR faces (1),
.IR filter (1),
.IR mail (1),
.IR marshal (1),
.IR mlmgr (1),
.IR nedmail (1),
.IR qer (8),
.IR rewrite (6),
.IR send (8),
.IR upasfs (4)
.SH BUGS
Usually messages flagged for deletion with
.B DELE
are not actually deleted until the client sends a
.B QUIT
command to end the conversation.
.I Pop3
implements a non-standard command
.B SYNC
that deletes messages flagged for deletion
without ending the conversation.