152 lines
4.8 KiB
Groff
152 lines
4.8 KiB
Groff
.\" $NetBSD: mailwrapper.8,v 1.6 1999/03/25 16:40:17 is Exp $
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.\" $FreeBSD$
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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 December 16, 1998
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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 MTA 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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At one time, the only Mail Transfer Agent (MTA) software easily available
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was
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.Xr sendmail 8 .
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As a result of this, most Mail User Agents (MUAs) such as
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.Xr mail 1
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had the path and calling conventions expected by
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.Xr sendmail 8
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compiled in.
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.Pp
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Times have changed, however.
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On a modern
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.Ux
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system, the administrator may wish to use one of several
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available MTAs.
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.Pp
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It would be difficult to modify all MUA software typically available
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on a system, so most of the authors of alternative MTAs have written
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their front end message submission programs so that they use the same
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calling conventions as
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.Xr sendmail 8
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and may be put into place instead of
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.Xr sendmail 8
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in
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.Pa /usr/sbin/sendmail .
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.Pp
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.Xr sendmail 8
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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 MTAs provide similar
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functionality, either through a program that also switches behavior
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based on calling name, or through a set of programs that provide
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similar functionality.
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.Pp
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Although having replacement programs that plug replace
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.Xr sendmail 8
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helps in installing alternative MTAs, it essentially makes the
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configuration of the system depend on hard 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 MTA without altering the system
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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
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machines, and may wish to avoid placing implicit configuration
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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 MTA instead of
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.Xr sendmail 8
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based on configuration information placed in
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.Pa /etc/mail/mailer.conf .
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This permits the administrator to configure which MTA is to be invoked on
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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/mail/mailer.conf .
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.Pa /usr/sbin/sendmail
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is typically set up as a symbolic link to
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.Nm
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which is not usually invoked on its own.
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.Sh DIAGNOSTICS
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.Nm
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will return an error value and print a diagnostic if its configuration
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file is missing or malformed, or does not contain a mapping for the
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name under which
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.Nm
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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 mailer.conf 5 ,
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.Xr sendmail 8 .
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.Sh HISTORY
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.Nm
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first appeared in
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.Nx 1.4
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and then
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.Fx 4.0 .
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.Sh AUTHORS
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Perry E. Metzger <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 "behave
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differently if invoked with a different name" behavior of things like
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.Xr mailq 1
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should go away.
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