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-.\" $NetBSD: mailwrapper.8,v 1.6 1999/03/25 16:40:17 is Exp $
-.\"
-.\" Copyright (c) 1998
-.\" Perry E. Metzger. All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\" notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\" notice, this list of conditions and the following disclaimer in the
-.\" documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\" must display the following acknowledgment:
-.\" This product includes software developed for the NetBSD Project
-.\" by Perry E. Metzger.
-.\" 4. The name of the author may not be used to endorse or promote products
-.\" derived from this software without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
-.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
-.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
-.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
-.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
-.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
-.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-.\"
-.\" The following requests are required for all man pages.
-.Dd December 16, 1998
-.Dt MAILWRAPPER 8
-.Os
-.Sh NAME
-.Nm mailwrapper
-.Nd invoke appropriate MTA software based on configuration file
-.Sh SYNOPSIS
-Special. See below.
-.Sh DESCRIPTION
-At one time, the only Mail Transfer Agent (MTA) software easily available
-was
-.Xr sendmail 8 .
-As a result of this, most Mail User Agents (MUAs) such as
-.Xr mail 1
-had the path and calling conventions expected by
-.Xr sendmail 8
-compiled in.
-.Pp
-Times have changed, however.
-On a modern
-.Nx
-system, the administrator may wish to use one of several
-available MTAs.
-.Pp
-It would be difficult to modify all MUA software typically available
-on a system, so most of the authors of alternative MTAs have written
-their front end message submission programs so that they use the same
-calling conventions as
-.Xr sendmail 8
-and may be put into place instead of
-.Xr sendmail 8
-in
-.Pa /usr/sbin/sendmail .
-.Pp
-.Xr sendmail 8
-also typically has aliases named
-.Xr mailq 1
-and
-.Xr newaliases 1
-linked to it. The program knows to behave differently when its
-.Va argv[0]
-is
-.Dq mailq
-or
-.Dq newaliases
-and behaves appropriately. Typically, replacement MTAs provide similar
-functionality, either through a program that also switches behavior
-based on calling name, or through a set of programs that provide
-similar functionality.
-.Pp
-Although having replacement programs that plug replace
-.Xr sendmail 8
-helps in installing alternative MTAs, it essentially makes the
-configuration of the system depend on hard installing new programs in
-.Pa /usr .
-This leads to configuration problems for many administrators, since
-they may wish to install a new MTA without altering the system
-provided
-.Pa /usr .
-(This may be, for example, to avoid having upgrade problems when a new
-version of the system is installed over the old.)
-They may also have a shared
-.Pa /usr
-among several
-machines, and may wish to avoid placing implicit configuration
-information in a read-only
-.Pa /usr .
-.Pp
-The
-.Nm
-program is designed to replace
-.Pa /usr/sbin/sendmail
-and to invoke an appropriate MTA instead of
-.Xr sendmail 8
-based on configuration information placed in
-.Pa /etc/mailer.conf .
-This permits the administrator to configure which MTA is to be invoked on
-the system at run time.
-.Sh FILES
-Configuration for
-.Nm
-is kept in
-.Pa /etc/mailer.conf .
-.Pa /usr/sbin/sendmail
-is typically set up as a symlink to
-.Nm
-which is not usually invoked on its own.
-.Sh DIAGNOSTICS
-.Nm
-will return an error value and print a diagnostic if its configuration
-file is missing or malformed, or does not contain a mapping for the
-name under which
-.Nm
-was invoked.
-.Sh SEE ALSO
-.Xr mail 1 ,
-.Xr mailq 1 ,
-.Xr mailer.conf 5 ,
-.Xr newaliases 1 ,
-.Xr sendmail 8 .
-.Sh HISTORY
-.Nm
-appeared in
-.Nx 1.4 .
-.Sh AUTHORS
-Perry E. Metzger <perry@piermont.com>
-.Sh BUGS
-The entire reason this program exists is a crock. Instead, a command
-for how to submit mail should be standardized, and all the "behave
-differently if invoked with a different name" behavior of things like
-.Xr mailq 1
-should go away.