Problems with false positives

11 msg	SMTP authentication with saslauthd against PAM
7 msg	Error in SMTP sequence
2 msg	dkim-milter on relay server unknown-jobid exter...
11 msg	Stubborn Cert issue

Problems with false positives
\ Instituto de Ingenieria Área de (12 Apr 2007)
. \ David Rees (12 Apr 2007)
. \ mouss (13 Apr 2007)

4 msg	reject_unverified_recipient case sensitive?
3 msg	dkim=fail (verification error: invalid key gran...
5 msg	? Using header checks on (Postini) X-pstn-levels
2 msg	Can't find error in my config file. Can you?
1 msg	chroot postgresql ssl problem
15 msg	What cert to buy
3 msg	Address re-writing
9 msg	Mail Rejected when we relay for a client.
8 msg	Queueing up archive messages
2 msg	Cannot send e-mails from any e-mail clients
1 msg	Re: outbound mail failure - need to fix asap -S...
4 msg	outbound mail failure - need to fix asap
3 msg	Postfix alias problem
2 msg	problem to send a mail to a command in aliases
3 msg	smtpd_auth

Subject:	Problems with false positives
Group:	Postfix-users
From:	Instituto de Ingenieria Área de Sistemas Unix/Linux
Date:	12 Apr 2007

Hello everyone,
Something weird is happenning with my spamassassin, you see. almost all of
the users on my server are on an email notification system, so all of them
receive the same message from the same address, it's ok and i even
withelisted the address, the problem is that even then I'm getting some
false positives, so of the 2000 mails, a significant portion (around 200)
get classified as spam. Also none of my users has personal rules, so
everything is filtered by my server.

So why does spamassassin classifies some mails even though it's exactly the
same message for all the addresses?

thank you very much
--
Instituto de Ingeniería de la UNAM
Coordinación de Sistemas de Cómputo
Área de Sistemas Unix/Linux