mail deleted by spamassassin?

[Bob Hou]

Hi,
I am running linux FC4 (kernel-2.6.14) with spamassassin-3.0.4 and sendmail-8.13.4.
I notice that the users did not get any spam marked email after I update the system from FC3 to FC4. So I test it with a blacklist_from.
It seems very strange that I don't get the email sent from the email account listed in the blacklist_from when the spamassassin running and I do get the email
if I stop the spamassassin.
Can anybody help me on this issue please?
The local.cf from /etc/mail/spamassassin/ looks like:
#
required_hits 5
rewrite_subject 1
report_safe 0
rewrite_header Subject [SPAM]
blacklist_from [EMAIL PROTECTED]
#
#


Thanks,
Bob