A new update is available for Fedora Core - [SECURITY] Fedora Core 4 Update: spamassassin-3.0.4-2.fc4. Here the announcement:

Fedora Update Notification
FEDORA-2005-1066
2005-11-09
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Product : Fedora Core 4
Name : spamassassin
Version : 3.0.4
Release : 2.fc4
Summary : Spam filter for email which can be invoked from mail delivery agents.
Description :
SpamAssassin provides you with a way to reduce if not completely eliminate
Unsolicited Commercial Email (SPAM) from your incoming email. It can
be invoked by a MDA such as sendmail or postfix, or can be called from
a procmail script, .forward file, etc. It uses a genetic-algorithm
evolved scoring system to identify messages which look spammy, then
adds headers to the message so they can be filtered by the user's mail
reading software. This distribution includes the spamd/spamc components
which create a server that considerably speeds processing of mail.

To enable spamassassin, if you are receiving mail locally, simply add
this line to your ~/.procmailrc:
INCLUDERC=/etc/mail/spamassassin/spamassassin-default.rc

To filter spam for all users, add that line to /etc/procmailrc
(creating if necessary).

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Update Information:

Solves CVE-2005-3351 and a few other minor bugs to improve
spam detection accuracy. You could consider this a release
candidate for 3.0.5.

Also solved is #161785 which ensures that "service
spamassassin restart" should never fail.
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* Tue Nov 8 2005 Warren Togami <wtogami@redhat.com> - 3.0.4-2
- 3.0.5 release candidate


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This update can be downloaded from:
http://download.fedora.redhat.com/pub/fedora/linux/core/updates/4/

a3184e0e7b45e21c81fe1c00ff5ccfac SRPMS/spamassassin-3.0.4-2.fc4.src.rpm
1a6999505d3a2463a0fc5846e6aceb54 ppc/spamassassin-3.0.4-2.fc4.ppc.rpm
c38abb943979ffdcbda9ca17d8de4310 ppc/debug/spamassassin-debuginfo-3.0.4-2.fc4.ppc.rpm
275684eefc91620a9c566a90e5597ff1 x86_64/spamassassin-3.0.4-2.fc4.x86_64.rpm
2f6d781ce0bb53b5e981fbe10638413c x86_64/debug/spamassassin-debuginfo-3.0.4-2.fc4.x86_64.rpm
00fa4a7e89ab752961b4601b3cbd5431 i386/spamassassin-3.0.4-2.fc4.i386.rpm
61e7a5f2ebbb12304fd88ea33aca1c9a i386/debug/spamassassin-debuginfo-3.0.4-2.fc4.i386.rpm

This update can also be installed with the Update Agent; you can
launch the Update Agent with the 'up2date' command.