how to truncate messages

[Razvan Cosma]

Hello, I have a Postfix daemon that handles just one task - receive bounces (user not found, autoresponders, temporary server errors). It simply pipes all messages to a "| usr/local/bin/script.pl". The reason I don't have the Perl app listening on port 25 itself is SPAM and other attacks that Postfix handles very well. My question is: can I instruct it to truncate all incoming messages to a byte limit? I don't care about the actual message contents after 1000 bytes or so where I should find the reason of the bounce.