Block mailsby Subject

Revision as of 13:50, 19 October 2021 by Nbhagwat (talk | contribs) (→‎Solution)

How to block mails by subjects?

   KB 24368        Last updated on 2021-10-19  

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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 in spamassassin folder as root

vi /opt/zimbra/data/spamassassin/rules/

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/
zmantispamctl restart 
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