Configure strict rules which hosts are allowed to relay Email

[christz]

Hi,
I want to configure our zimbra MTA so that it _only_ relays Mail coming from a certain IP address (e.g. 1.2.3.4) _and_ if the user has authenticated successfully using SMTP TLS authentication.

So the zimbra MTA should _only_ relay an email if:

- it is coming from localhost or from 1.2.3.4. Even hosts in the same subnet of the zimbra MTA must not be allowed to relay mail!

_and_

- if the user has authenticated successfully using SMTP TLS authentication. No other authentication schemes should be allowed! If the email comes from localhost prior SMTP TLS authentication is not a must.


Thanks in advance,
christz