Blocking spams for hosted zimbra
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hello
ZIMBRA email server is hosted and spams just keep coming.
How can we block spams. Could we use pfblockerng? or what is best for this?
Many thanks
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Zimbra uses Postfix, so your first step is to use DNSRBLs. Your biggest bang would be to add Spamhaus Zen.
You can run the following command to see what restrictions have been configured:
zmprov gacf | grep zimbraMtaRestriction
Recommend the following settings:
zimbraMtaRestriction: reject_invalid_hostname zimbraMtaRestriction: reject_non_fqdn_hostname zimbraMtaRestriction: reject_non_fqdn_sender zimbraMtaRestriction: reject_unknown_client zimbraMtaRestriction: reject_unknown_hostname zimbraMtaRestriction: reject_unknown_sender_domain zimbraMtaRestriction: reject_rbl_client zen.spamhaus.org zimbraMtaRestriction: reject_rbl_client bl.spamcop.net zimbraMtaRestriction: reject_rbl_client b.barracudacentral.org zimbraMtaRestriction: reject_rhsbl_client dbl.spamhaus.org zimbraMtaRestriction: reject_rhsbl_reverse_client dbl.spamhaus.org zimbraMtaRestriction: reject_rhsbl_sender dbl.spamhaus.org
For pfBlockerNG, I wrote a script to import over 50 Blocklists here:
https://forum.pfsense.org/index.php?topic=86212.msg549973#msg549973It has a MAIL section which will also help reduce SPAM.