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https://wiki.zimbra.com/wiki/New_Features_ZCS_8.5
See also Zimbra Antivirus and Antispam
See also Zimbra DKIM Configuration
Howto: http://shahzadlinux.blogspot.com/2016/03/how-to-blacklist-or-whitelist-ip.html
In a pinch, you can add an IP address to the Postfix
mynetworks
definition of trusted hosts.
Become the zimbra
user:
su - zimbra
vim /opt/zimbra/conf/postfix_rbl_override xxx.xxx.xxx.xxx OK
then:
postmap /opt/zimbra/conf/postfix_rbl_override zmprov mcf +zimbraMtaRestriction 'check_client_access lmdb:/opt/zimbra/conf/postfix_rbl_override'
vim /opt/zimbra/conf/postfix_blacklist xxx.xxx.xxx.xxx REJECT
then:
postmap /opt/zimbra/conf/postfix_blacklist zmprov mcf +zimbraMtaRestriction 'check_client_access lmdb:/opt/zimbra/conf/postfix_blacklist'
zmmtactl restart