183 lines
5.0 KiB
Groff
183 lines
5.0 KiB
Groff
.\" $OpenBSD: mail.local.8,v 1.33 2022/03/31 17:27:19 naddy Exp $
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.\" Copyright (c) 1990 The Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)mail.local.8 6.8 (Berkeley) 4/27/91
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.\"
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.Dd $Mdocdate: March 31 2022 $
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.Dt MAIL.LOCAL 8
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.Os
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.Sh NAME
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.Nm mail.local
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.Nd store mail in a mailbox
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.Sh SYNOPSIS
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.Nm mail.local
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.Op Fl Ll
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.Op Fl f Ar from
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.Ar user ...
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.Sh DESCRIPTION
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.Nm
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reads the standard input up to an end-of-file and appends it to each
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.Ar user Ns 's
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.Pa mail
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file.
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The
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.Ar user
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must be a valid user name.
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.Pp
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The options are as follows:
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.Bl -tag -width Ds
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.It Fl f Ar from
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Specify the sender's name.
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.It Fl L
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Don't create a
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.Pa username.lock
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file while locking the spool.
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.It Fl l
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For compatibility, request that files named
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.Pa username.lock
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be used for locking.
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(This is the default behavior.)
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.El
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.Pp
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Individual mail messages in the mailbox are delimited by an empty
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line followed by a line beginning with the string
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.Dq "From\&\ " .
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A line containing the string
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.Dq "From\&\ " ,
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the sender's name and a timestamp is prepended to each delivered mail message.
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A blank line is appended to each message.
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A greater-than character
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.Pq Ql >
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is prepended to any line in the message which could be mistaken for a
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.Dq "From\&\ "
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delimiter line.
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.Pp
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Significant effort has been made to ensure that
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.Nm
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acts as securely as possible.
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It will only deliver to a mail spool directory that is not world-writable.
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The default mode of
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.Pa /var/mail
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on
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.Ox
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is 755, which prevents non-root processes from creating mail spool files.
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The MTA is expected to either create the mail spool file itself, or call
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.Nm
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as root.
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.Pp
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The mailbox is always locked using
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.Xr flock 2
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while mail is appended.
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Unless the
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.Fl L
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flag is specified, a
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.Pa username.lock
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file is also used.
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.Pp
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If the
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.Xr biff 1
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service is returned by
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.Xr getservbyname 3 ,
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the biff server is notified of delivered mail.
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.Sh ENVIRONMENT
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.Bl -tag -width indent
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.It Ev TZ
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Used to set the appropriate time zone on the timestamp.
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.El
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.Sh FILES
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.Bl -tag -width /tmp/local.XXXXXXXXXX -compact
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.It Pa /tmp/local.XXXXXXXXXX
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temporary files
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.It Pa /var/mail/user
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user's mailbox directory
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.El
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.Sh EXIT STATUS
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.Ex -std mail.local
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.Sh SEE ALSO
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.Xr biff 1 ,
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.Xr mail 1 ,
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.Xr flock 2 ,
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.Xr getservbyname 3 ,
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.Xr comsat 8 ,
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.Xr smtpd 8
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.Sh HISTORY
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A superset of
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.Nm
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(handling mailbox reading as well as mail delivery) appeared in
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.At v7
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as the program
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.Xr mail 1 .
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.Sh BUGS
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Using quotas in
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.Pa /var/mail
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can be problematic if using
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.Xr sendmail 8
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as an MTA,
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since it asks
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.Nm
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to deliver a message to multiple recipients if possible.
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This causes problems in a quota environment since a message may be
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delivered to some users but not others due to disk quotas.
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Even though the message was delivered to some of the recipients,
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.Nm
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will exit with an exit code > 0, causing
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.Xr sendmail 8
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to attempt redelivery later.
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That means that some users will keep getting the same message every time
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.Xr sendmail 8
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runs its queue.
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This problem does not exist for
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.Xr smtpd 8
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users.
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.Pp
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If you are running
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.Xr sendmail 8
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and have disk quotas on
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.Pa /var/mail ,
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it is imperative that you unset the
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.Dq m
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mailer flag for the
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.Sq local
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mailer.
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To do this, locate the line beginning with
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.Dq Mlocal
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in
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.Pa /etc/mail/sendmail.cf
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and remove the
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.Dq m
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from the flags section, denoted by
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.Dq F= .
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Alternately, you can override the default mailer flags by adding the line:
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.Pp
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.Dl define(`LOCAL_MAILER_FLAGS', `rn9S')dnl
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.Pp
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to your
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.Dq \.mc
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file (this is the source file that is used to generate
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.Pa /etc/mail/sendmail.cf ) .
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