The following thing is not working on zimbra 7. What may be the reason?
Domain level blocking of users - Zimbra :: Wiki
I did use it on zimbra 6 and it was working fine. I could block a whole domain by putting only the domain name for the /opt/zimbra/postfix/conf/reject file
But domains not getting rejected on Zimbra 7 after completing above steps.
Even rejecting emails at smtp level also not working on zimbra 7