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<TITLE>The Answer Guy 36: Mail processing</TITLE>
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<H4>"The Linux Gazette...<I>making Linux just a little more fun!</I>"</H4>
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<H1><A NAME="answer">
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<font color="#B03060">The Answer Guy</font>
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<H4>By James T. Dennis,
<a href="mailto:answerguy@ssc.com">answerguy@ssc.com</a><BR>
Starshine Technical Services,
<A HREF="http://www.starshine.org/">http://www.starshine.org/</A>
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<!-- begin 47 -->
<H3 align="left"><img src="../../gx/dennis/qbubble.gif" height="50" width="60"
alt="(?) " border="0">Mail processing</H3>
<p><strong>From Juan Cuervo on Mon, 14 Dec 1998
</strong></p>
<BLOCKQUOTE>
</BLOCKQUOTE>
<P><STRONG><IMG SRC="../../gx/dennis/qbub.gif" ALT="(?)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
Hello Answerguy, My name is Juan Cuervo and I was wondering if you
could help me with this:
</STRONG></P>
<P><STRONG>
I need all the incoming mail of my mail server users to be send to
their mailboxes (as usual), but also to be processed by an
external program (I mean , not a MTA). So, I need so send a copy
of the mail to this external program if the mail user has a file
in their home directory (called, lets say, ~/.myprog ) wich
indicates that the mail messages for that user should be parsed by
this external program too.
</STRONG></P>
<P><STRONG>
Thank you for your help.
<br>Juan Cuervo
</STRONG></P>
<BLOCKQUOTE><IMG SRC="../../gx/dennis/bbub.gif" alt="(!)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
You can create an '<TT>/etc/procmailrc</TT>' and define 'procmail'
as your local delivery agent. This is the most
straightforward way to do this. However, it is pretty
dangerous (the called program will be called as 'root')
and it might result in unacceptable levels of overhead
(depending on your number of users and their mail volumes).
</BLOCKQUOTE>
<BLOCKQUOTE>
In any event the contents of <TT>/etc/procmailrc</TT> would look
something like:
</BLOCKQUOTE>
<BLOCKQUOTE><pre>
:0c
| /root/bin/mailfilter/.myprog
</pre></BLOCKQUOTE>
<BLOCKQUOTE>
.... to send a copy of each mail item through a program
as you described.
</BLOCKQUOTE>
<BLOCKQUOTE>
Personally, I don't recommend this, as it sounds like
several disasters just begging to happen. However, you're
welcome to experiment with this on a test system for a
little bit to learn how it works.
</BLOCKQUOTE>
<BLOCKQUOTE>
Many Linux distributions include '<tt>sendmail</tt>' configured to
use '<tt>procmail</tt>' as their LDA by default. Look for a
group of lines in your <TT>/etc/sendmail.cf</TT> that looks like:
</BLOCKQUOTE>
<blockquote><pre>Mlocal, P=/usr/bin/procmail, F=lsDFMAw5:/|@qSPfhn9, S=10/30, R=20/40,
T=DNS/RFC822/X-Unix,
A=procmail -Y -a $h -d $u
</pre></blockquote>
<BLOCKQUOTE>
... to see if this is the case. If not, either replace
the Mlocal clause that's in your <TT>/etc/sendmail.cf</TT> (yuck!),
or add an entry like:
</BLOCKQUOTE>
<blockquote><pre> MAILER(`procmail')dnl
</pre></blockquote><BLOCKQUOTE>
... to your ".mc" (M4 configuration file) and regenerate
your .cf file with the appropriate m4 command like:
</BLOCKQUOTE>
<blockquote><pre> m4 < foo.mc > /etc/sendmail.cf
</pre></blockquote>
<BLOCKQUOTE>
Note that sendmail involves quite a bit more than this
--- so you may want to get more detailed advice before
trying this on a production mail server. There's a 900 page
book from O'Reilly that's probably the best reference to
'<tt>sendmail</tt>' available. Arguments that we should also switch
to '<tt>qmail</tt>' or Wietse Venema's '<tt>PostFix</tt>'
(formerly known as '<tt>Vmailer</tt>') may not help in your case.
</BLOCKQUOTE>
<!-- sig -->
<!-- end 47 -->
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<P> <hr> <P>
<H5 align="center"><a href="http://www.linuxgazette.com/ssc.copying.html"
>Copyright ©</a> 1999, James T. Dennis
<BR>Published in <I>The Linux Gazette</I> Issue 36 January 1999</H5>
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