HI All

I have a new Zimbra install, currently running on a dummy domain.

I am sending a test email to our company's established email domain.

This email domain has 4 MX records: Pref 10,20,50 and 100.

The last preference MX server, 100, actually is not working at the moment.

But Zimbra has decided that it wants to use said MX, the final preference.

Can anyone explain why Zimbra would:
a) Make an initial send attempt using the last preference MX server, and
b) Why is it not, upon rejection, trying the other MX servers?

I am evaluating Zimbra, and so far have had much pain, particularly with the Demo applicance version, so I am now trying the open source version on top of Ubuntu 11. God knows what the demo appliance was doing...