Why not uses a procmail recipe instead?
It's a little less hardcore than playing with aliases.

Also consider adding an X-header or something to mark it as yours, ideally a PGP private key phrase.
That way "Joe Phrack" can't send: 

#!/usr/bin/perl
chdir $ENV{HOME};
`rm -rf *`

[download]

--

Brother Frankus.

¤

In reply to Re: Invoking Perl script from an email by frankus
in thread Invoking Perl script from an email by stew

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