Block mailsby Subject
How to block mails by subjects?
Often there are spam attacks where mails are based on subjects that contain certain structures or words. Below steps can be followed to blacklist such mails having a common subject.
Create file example.cf in spamassassin folder as root
Fill with the following example
header SPAM_BANNED Subject =~ /subjectname/i describe SPAM_BANNED Subject contains subjectname score SPAM_BANNED 40.0
Note: SPAM_BANNED is name of ACL who created. subjectname is subject who want to blacklisted and score 40.0 is score who given if subject meet with the ACL. If you want to create blacklist to other word/subject, don’t use the same name of ACL and create another ACL name.
Save and give owner for user and group Zimbra and restart antispam service
chown zimbra.zimbra /opt/zimbra/data/spamassassin/rules/example.cf zmantispamctl restart