[CentOS] Spamassassin/Sendmail issues

I am running a server with Centos 4.4, using a combo of 
sendmail-clamav-spamassassin for mail, which has been working quite well 
up until last night. Around 3:00am, all mail going to all users was 
being rejected by spamassassin. My ~/mail/.procmailrc is as follows:

========================
MAILDIR=$HOME/mail

#
:0 H
* ^X-Spam-Status:.*Yes
{
EXITCODE=67
:0:
/dev/null
}
=========================

Checking yum logs, nothing that would affect SA or sendmail was updated, 
so I have no idea why everything would suddenly go bananas. Clamav was 
updated, but that was at 5:00am, and the mails were getting bounced back 
starting at 3:00. I am attaching 2 maillog snips showing mail from the 
centos list, with one going thru as expected and the other getting 
bounced back per my .procmailrc file. Any help appreciated.

-- 
TomE.
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