170 lines
4.9 KiB
Groff
170 lines
4.9 KiB
Groff
.\" $NetBSD: mailwrapper.8,v 1.18 2017/07/04 07:10:35 wiz Exp $
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.\"
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.\" Copyright (c) 1998
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.\" Perry E. Metzger. 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. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgment:
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.\" This product includes software developed for the NetBSD Project
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.\" by Perry E. Metzger.
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.\" 4. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" The following requests are required for all man pages.
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.Dd April 10, 2010
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.Dt MAILWRAPPER 8
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.Os
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.Sh NAME
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.Nm mailwrapper
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.Nd invoke appropriate
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.Tn MTA
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software based on configuration file
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.Sh SYNOPSIS
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Special.
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See below.
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.Sh DESCRIPTION
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Once upon time, the only Mail Transfer Agent
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.Pq Tn MTA
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software easily available was
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.Dq sendmail .
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This famous
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.Tn MTA
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was written by
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.An Eric Allman
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and first appeared in
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.Bx 4.1 .
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The legacy of this
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.Tn MTA
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affected most Mail User Agents
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.Pq Tn MUAs
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such as
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.Xr mail 1 ;
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the path and calling conventions expected by
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.Dq sendmail
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were compiled in.
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.Pp
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But times changed.
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On a modern
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.Nx
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system, the administrator may wish to use one of several available
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.Tn MTAs .
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.Pp
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It would be difficult to modify all
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.Tn MUA
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software typically available on a system,
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so most of the authors of alternative
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.Tn MTAs
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have written their front end message submission programs
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that may appear in the place of
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.Pa /usr/sbin/sendmail ,
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but still follow the same calling conventions as
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.Dq sendmail .
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.Pp
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The
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.Dq sendmail
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.Tn MTA
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also typically has aliases named
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.Xr mailq 1
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and
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.Xr newaliases 1
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linked to it.
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The program knows to behave differently when its
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.Va argv[0]
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is
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.Dq mailq
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or
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.Dq newaliases
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and behaves appropriately.
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Typically, replacement
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.Tn MTAs
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provide similar functionality, either through a program that also
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switches behavior based on calling name, or through a set of programs
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that provide similar functionality.
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.Pp
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Although having replacement programs that plug replace
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.Dq sendmail
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helps in installing alternative
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.Tn MTAs ,
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it essentially makes the configuration of the system depend
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on hand installing new programs in
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.Pa /usr .
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This leads to configuration problems for many administrators, since
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they may wish to install a new
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.Tn MTA
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without altering the system provided
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.Pa /usr .
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(This may be, for example, to avoid having upgrade problems when a new
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version of the system is installed over the old.)
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They may also have a shared
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.Pa /usr
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among several machines, and may wish to avoid placing
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implicit configuration information in a read-only
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.Pa /usr .
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.Pp
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The
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.Nm
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program is designed to replace
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.Pa /usr/sbin/sendmail
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and to invoke an appropriate
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.Tn MTA
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based on configuration information placed in
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.Pa /etc/mailer.conf .
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This permits the administrator to configure which
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.Tn MTA
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is to be invoked on the system at run time.
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.Sh FILES
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Configuration for
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.Nm
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is kept in
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.Pa /etc/mailer.conf .
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.Pa /usr/sbin/sendmail
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is typically set up as a symlink to
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.Nm
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which is not usually invoked on its own.
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.Sh EXIT STATUS
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.Ex -std
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.Sh DIAGNOSTICS
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.Nm
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will print a diagnostic if its configuration file is missing or malformed,
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or does not contain a mapping for the name under which it was invoked.
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.Sh SEE ALSO
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.Xr mail 1 ,
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.Xr mailq 1 ,
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.Xr newaliases 1 ,
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.Xr postfix 1 ,
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.Xr mailer.conf 5
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.Sh HISTORY
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The
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.Nm
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program appeared in
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.Nx 1.4 .
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.Sh AUTHORS
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.An Perry E. Metzger Aq Mt perry@piermont.com
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.Sh BUGS
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The entire reason this program exists is a crock.
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Instead, a command
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for how to submit mail should be standardized, and all the
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.Dq behave differently if invoked with a different name
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behavior of things like
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.Xr mailq 1
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should go away.
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