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Filtering Mail with Perl

Posted on 1998-10-20
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Last Modified: 2010-03-04
What I am needing to do is install a script onto a UNIX system that will allow all of the e-mail coming to my address to be filtered based on the from address or the subject.  I want the mail to either be deleted, forwarded, or have nothing happen to each message - based on what I specify.  Do you know of any way I can do this, or know of a program that will do this?  Your help would be greatly appreciated!
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Question by:jeikenb
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b2pi earned 200 total points
ID: 1205554
procmail will do all of this, as well as much more.  In fact, chances are it's already on your system, and your system directory is checked for a .procmailrc each time you get mail.  Try

man procmail

and then

man procmailrc

Warning: procmail recipes are non-trivial, but have nothing to do with perl.
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by:jeikenb
ID: 1205555
Thanks for the suggestion, but it doesn't work on my system.  We are running BSDI 3.1 and I can't find anything in regards to procmail on the server.  Do you have any other suggestions?
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Expert Comment

by:b2pi
ID: 1205556
I find it very surprising that bsdi doesn't include procmail, or
something with equivalent (superset) functionality.

( BTW, most of this info is from the procmail man file)

In any case, if you download and install procmail (say, in ~/bin), and
then put the following in your .forward file

|IFS=' '&&p=/ms/dist/aurora/bin/procmail&&test -f $p&&exec $p
-Yf-||exit 75 #YOUR_USERNAME

(note, that's all on one line, and your .forward _must_ be
world-readable).

Finally, if you don't have .forward functionality, get a new system
administrator. OK, try that again.  If you don't have .forward
functionality, you can run procmail manually or from a cron job via
the following script:

#!/bin/sh

ORGMAIL=/var/spool/mail/$LOGNAME

if cd $HOME &&
    test -s $ORGMAIL &&
    lockfile -r0 -l1024 .newmail.lock 2>/dev/null
then
    trap "rm -f .newmail.lock" 1 2 3 13 15
    umask 077
    lockfile -l1024 -ml
    cat $ORGMAIL >>.newmail &&
    cat /dev/null >$ORGMAIL
    lockfile -mu
    formail -s procmail <.newmail &&
    rm -f .newmail
    rm -f .newmail.lock
fi
exit 0

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