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\"      Perry E. Metzger.  All rights reserved.
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Dd April 10, 2010
Dt MAILWRAPPER 8
Os
Sh NAME
Nm mailwrapper
Nd invoke appropriate
Tn MTA
software based on configuration file
Sh SYNOPSIS
Special.
See below.
Sh DESCRIPTION
Once upon time, the only Mail Transfer Agent
Pq Tn MTA
software easily available was
Dq sendmail .
This famous
Tn MTA
was written by
An Eric Allman
and first appeared in
Bx 4.1 .
The legacy of this
Tn MTA
affected most Mail User Agents
Pq Tn MUAs
such as
Xr mail 1 ;
the path and calling conventions expected by
Dq sendmail
were compiled in.
Pp
But times changed.
On a modern
Nx
system, the administrator may wish to use one of several available
Tn MTAs .
Pp
It would be difficult to modify all
Tn MUA
software typically available on a system,
so most of the authors of alternative
Tn MTAs
have written their front end message submission programs
that may appear in the place of
Pa /usr/sbin/sendmail ,
but still follow the same calling conventions as
Dq sendmail .
Pp
The
Dq sendmail
Tn MTA
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
Tn 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
Dq sendmail
helps in installing alternative
Tn MTAs ,
it essentially makes the configuration of the system depend
on hand installing new programs in
Pa /usr .
This leads to configuration problems for many administrators, since
they may wish to install a new
Tn 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
Tn MTA
based on configuration information placed in
Pa /etc/mailer.conf .
This permits the administrator to configure which
Tn 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 EXIT STATUS
Ex -std
Sh DIAGNOSTICS
Nm
will print a diagnostic if its configuration file is missing or malformed,
or does not contain a mapping for the name under which it was invoked.
Sh SEE ALSO
Xr mail 1 ,
Xr mailq 1 ,
Xr newaliases 1 ,
Xr postfix 1 ,
Xr mailer.conf 5
Sh HISTORY
The
Nm
program appeared in
Nx 1.4 .
Sh AUTHORS
An Perry E. Metzger Aq Mt [email protected]
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
Dq behave differently if invoked with a different name
behavior of things like
Xr mailq 1
should go away.

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