From couple of weeks ago, all our customers has start receiving spam emails. It seems like spamAssassin is not working as it should work. What could be the reasons?
I really hate when I need to answer my own questions :)
I have added following server list in Plesk control panel -> Server -> Mail -> Preferences Switch on spam protection based on DNS blackhole lists (DNS zones for DNSBL service)
abuse.rfc-ignorant.org; zen.spamhaus.org; cbl.abuseat.org; bl.spamcop.net; nomail.rhsbl.sorbs.net
and It is fixed.
protected by Tom O'Connor Feb 3 '14 at 11:31
Thank you for your interest in this question.
Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).
Would you like to answer one of these unanswered questions instead?