Help with Spamassassin and Procmail (message size)

I run a (redhat9) linux box mainly for mail.  Lately with lots of emails with attachments coming through I am finding it grinding to a halt as it spends 10 minutes looking through an email attachment for spam keywords.

All incoming mail goes through SpamAssassin via procmail.

My procmailrc looks like this:

INCLUDERC=/etc/mail/spamassassin/spamassassin-default.rc
LOGFILE=/var/log/procmail

----------------------

My spamassassin-default.rc looks like this:

# send mail through spamassassin
:0fw
| /usr/bin/spamassassin -P

What I would like to do is deliver all emails over 0.5mb in size, regardless of whether they are spam or not, by skipping spamassassin.  Anything less I want to analyse and log.

I know you can create a kind of IF statement in procmail, I just don't know how to do this.

Please help.
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coopaAsked:
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troopernCommented:
MailScanner can help you with your problem, and SpamAssassin is configurable to scan up to a certain size of messages if I'm correct.

or scan the messages with
/usr/bin/spamc -s size

see "man spamc" for further Details.
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troopernCommented:
note that the size is set in bytes.
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