Sendmail/courier. That does not matter. The old server will remain in place.
Here is the scenario I am looking for:
Mail comes in to Zimbra. If the account exists locally, deliver locally. If the account does not exist locally, forward message, via SMTP, unmodified to old legacy server.
This way I will be able to move users in small batches, or even one at a time to the new server. Users who are not yet moved do not have to change or do anything to their existing setup.
Sendmail and several commercial packages have this capability.
I know postfix has this capability. There is a single config file directive to accomplish this. With sendmail it's the LUSER_RELAY M4 macro. I just cannot locate the equivalent Postfix directive.
Mike |