Quote Originally Posted by maxchowhk View Post
eh.... This is just one of those. But how can I check whether my Zimbra does try sending to the A record?
I'm trying to figure out why you are convinced it's not.

Can you give a precise example where zimbra refused to deliver because there was no MX record, and there was a valid A record for the domain (the stuff to the right of the '@') and there was a SMTP listening on the proper port of that box?

This isn't the case for the one example that you've given.