At the moment all I was looking to do was test Zimbra, by hopefully making no changes to our current Exchange set up at all.
I thought the easiest way to do that would be by using a completely separate domain name which we currently have spare.
And somehow configuring Exchange to bounce all mail to a certain domain over to Zimbra's internal IP address.
At the moment port 25 is forwarded to our Exchange server on our local network.
Having re-read that Split Domain article, I'm unsure which option I'm looking for... Zimbra as the Primary or Secondary.
I guess the easiest route for me to configure the split domain would be like this:
- Forward 25 to Zimbra, rather than our Exchange server
- That means that any mail that can be delivered to a Zimbra account, is processed by Zimbra.
- Then I configure Zimbra's postfix to bounce other mail onto the Exchange server (using the local DNS address of the Exchange server) using the instructions on that Wiki article
Then if I decide to shut-down the Zimbra test server or do a fresh install onto a different machine, I just forward port 25 back to our main Exchange server like at the moment and Exchange handles all the inbound mail requests?
That would certainly be a good option - no configuration changes needed in Exchange!
But is that Zimbra as a primary or secondary?
My thinking that the above scenario represents Zimbra as a secondary,
even though it is technically acting as the primary SMTP receiving server at our IP address
Is that correct?
It's been a long day!
