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zimbra bounces from spam email

How to block backscatter email on zimbra. How many reasons why bounces from spam email.
zimbra bounces from spam email

To run commands as below
su - zimbra
zmprov mcf zimbraMtaEnableSmtpdPolicyd TRUE
zmprov mcf zimbraMtaSmtpdRejectUnlistedRecipient yes
zmprov mcf zimbraMtaSmtpdRejectUnlistedSender yes
zmprov mcf +zimbraMtaRestriction "check_policy_service unix:private/policy"
zmmtactl restart
zmconfigdctl restart

The solve problem
Bounces backscatter from spam email

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