[SOLVED] force zimbra to check reverse DNS for incoming mails

[snake_eyes]

Hello,

How to force zimbra to check the reverse DNS for the incoming traffic, if it can't resolve it reject the emails to the sender...

Cheers,

[snake_eyes]

no experts ?

[mmorse]

su - zimbra
zmprov mcf +zimbraMtaRestriction reject_unknown_client
zmprov gacf | grep zimbraMtaRestriction
postfix reload

~

DNS checks:

reject_unknown_sender_domain - Reject the request when the sender mail address domain has no DNS A or MX record. The unknown_address_reject_code is usually 450 in case of a temporary DNS error.

reject_unknown_client - Reject the request when the client IP address has no PTR (address to name) record in the DNS, or when the PTR record does not have a matching A (name to address) record.

reject_unknown_hostname - Reject the request when the hostname in the client HELO (EHLO) greeting command has no DNS A or MX record. The unknown_hostname_reject_code is defaulted to 450.


Protocol Checks:

reject_non_fqn_hostname - Sender address must be a fully qualified, such as sender@domain.com (on default).

reject_invalid_hostname - If hostname in EHLO greeting violates RFC (on default).

reject_non_fqdn_hostname - Client must greet with a fully qualified hostname.

[phoenix]

There's always some light week-end reading here: Postfix Documentation

[snake_eyes]

thank you phonix, solved