List Current setting
zmprov gcf zimbraMtaTransportMaps
zimbraMtaTransportMaps: proxy:ldap:/opt/zimbra/conf/ldap-transport.cf
Add destination domain to relay server or deny
vi /opt/zimbra/common/conf/transport
destination.com :xxx.xxx.xxx.xxx
dontsendto.com error:We don't allow send to dontsendto.com
postmap /opt/zimbra/common/conf/transport
Add "lmdb:/opt/zimbra/common/conf/transport" in to zimbraMtaTransportMaps
zmprov ms mail.abc.com zimbraMtaTransportMaps "lmdb:/opt/zimbra/common/conf/transport,proxy:ldap:/opt/zimbra/conf/ldap-transport.cf"
zmcontrol restart
