Connecting with SQLGrey
Download SQLGrey from:
http://sqlgrey.sourceforge.net/
As the zimbra user, update zimbraMtaRestriction. I've added all the other restrictions that Zimbra suggests to add as well, including several Realtime Blackhole Lists (RBL). The important one is at the end.
root# su - zimbra zimbra$ zmprov mcf zimbraMtaRestriction reject_invalid_hostname \ zimbraMtaRestriction reject_non_fqdn_sender \ zimbraMtaRestriction "check_policy_service inet:127.0.0.1:2501"
Edit /opt/zimbra/conf/postfix_recipient_restrictions.cf
... reject_unauth_destination %%contains VAR:zimbraMtaRestriction check_policy_service inet:127.0.0.1:2501%% permit
Now restart zimbra, and it should all just work!
root# su - zimbra zimbra$ zmcontrol stop zimbra$ zmcontrol start
Good luck, and enjoy.
--
Daniel Eugenin M.
IT Linux Ltda.