Hello,
I have to tune my SMTP restictions because sone users complains.
So I want to know the differences between "Client host rejected: cannot find your hostname" and "Helo command rejected: Host not found".

My MTA restrictions are :
[zimbra@mail2 ~]$ zmprov gacf | grep zimbraMtaRestriction
zimbraMtaRestriction: reject_non-fqdn_hostname
zimbraMtaRestriction: reject_non_fqdn_sender
zimbraMtaRestriction: reject_unknown_client
zimbraMtaRestriction: reject_unknown_hostname
zimbraMtaRestriction: reject_unknown_sender_domain
zimbraMtaRestriction: reject_rbl_client dnsbl.njabl.org
zimbraMtaRestriction: reject_rbl_client opm.blitzed.org
zimbraMtaRestriction: reject_rbl_client relays.ordb.org
zimbraMtaRestriction: reject_rbl_client cbl.abuseat.org
zimbraMtaRestriction: reject_rbl_client bl.spamcop.net

But now I want "Helo command rejected: Host not found" to pass through but I want to open the minimum !