Well.. each user has a zimbraMailTransport explicitly set, so it will override whatever settings you put for the domain. You can wipe out that setting or set it explicitly for each user which should work.
I'm not sure how you're going to get Zimbra to retrieve those messages, though.. Might I suggest that you just set the SMTP server that the web client uses to this external SMTP server and deliver them back to Zimbra? Then, of course, you would block access to Postfix on your Zimbra server for everyone except that external mail server. Then, all logs, messages, etc still pass through that server. Not sure if that helps your situation or not, but I thought I would throw that out there. |