Different internal / external email addresses

[henrythacker]

Hi,

We have successfully set up Zimbra on Debian for the internal email:

henry.thacker@mydomain.int

is an example of this address. This works great obviously for internal e-mail. Then I set up the Canonical address for the user and set it to

henry.thacker@mydomain.com

for which we own the domain and this too works great. The problem is, when we send internal e-mail now, this canonical address gets substituted for my internal address. This means that a user will get the email, but when they reply, it won't end up in my internal inbox.

Is it possible to configure Zimbra to only replace the address with the canonical address when mail has to be sent externally?