vim /opt/zimbra/conf/zmconfigd/smtpd_recipient_restrictions.cf
check_sender_access hash:/opt/zimbra/postfix/conf/restricted_senders
NExt
vim /opt/zimbra/conf/zmconfigd.cf
Search for “SECTION mta” and append directly under
POSTCONF smtpd_restriction_classes local_only
POSTCONF local_only FILE postfix_check_recipient_access.cf
so it should now look like:
SECTION mta DEPENDS amavis
POSTCONF smtpd_restriction_classes local_only
POSTCONF local_only FILE postfix_check_recipient_access.cf
Next
vim /opt/zimbra/conf/postfix_check_recipient_access.cf
check_recipient_access hash:/opt/zimbra/postfix/conf/local_domains, reject
vim /opt/zimbra/postfix/conf/restricted_senders
user@mydomain.com local_only
entiredomaintoblock.com local_only
Create file for allowed domains
vim /opt/zimbra/postfix/conf/local_domains
alloweddomain1.com OK
alloweddomain2.com OK
Run the following commands to Restart Postfix mail system and stuff
postmap /opt/zimbra/postfix/conf/restricted_senders
postmap /opt/zimbra/postfix/conf/local_domains
zmmtactl stop
zmmtactl start
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