[Mimedefang] calling system command

pete pete at nevill.uk.net
Sat Jan 8 20:12:49 EST 2011

 Thanks to both responders.I understand now what the problems was. I 
 will look into redirecting using aliases but on my test rig I used the 
 following to get this working.

 if ($Subject =~ /\brun ls \b/i) {
         $cmd = "ls";
         $tmp = `$cmd`;


 On Sat, 8 Jan 2011 16:55:47 -0800 (PST), kd6lvw at yahoo.com wrote:
> --- On Sat, 1/8/11, David F. Skoll <dfs at roaringpenguin.com> wrote:
>> pete <pete at nevill.uk.net> wrote:
>> > I would like to call a system command when a specific subject 
>> string
>> > is passed.
>> > if ($Subject =~ /\run ls\b/i) {
>> >     system("/bin/ls");
>> >     }
>> > This works the first time when I send a mail with "run ls" in the
>> > subject line but causes mimedefang to crash.
>> The problem is that your filter *must not* print anything ...
> Definently not good.  Look into sending the mail to a program instead
> (cf. sendmail's aliases database - entries starting with "|").
> If using the aliases database, you may want to end the command with
> an "||exit 0" just in case it fails - so a DSN isn't sent back to the
> sender (unless you want errors to be reported).  There are some cases
> (e.g. spamtraps feeding "|spamassassin -k") that shouldn't DNS back 
> on
> errors.
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