Thanks for that info:
ran: /home/admispconfig/ispconfig/tools/spamassassin/usr/bin/spamassassin -V
SpanAssassin version 3.1.0
running on Perl version 5.8.6
Only hungry processes:
web1_usersname(getting the email): cpu @ 55% when spamfilter is ON, server receiving email
postfix(getting the email): cpu @ 5% when spamfilter is OFF, server receiving email
I turned off the spamfilter on all the accounts for now(except the one I am testing with). Having the antivirus turned on seems good(cannot tell that it's running, and it is working).