Jshtimsj, not to interrupt your troubleshooting steps with Phoenix, but I think you may need to step back and review the Split Domain document a bit more. In the setup the document describes you would have an existing email server for some domain, let's say mydomain.com, and you want to introduce a Zimbra server which will also receive email for the same domain (mydomain.com). If I'm reading your previous posts correctly you seem to trying to send mail to mail.xyz.com and zimbra.xyz.com (or maybe it's xyz.com and zimbra.xyz.com). This isn't how Split Domain works. If you want to use a Split Domain setup you will need to decide if you want Zimbra to be primary or secondary. It sounds like secondary is a better method for you at this point, so you would need to figure out how to forward email from your existing QMail server over to the new Zimbra server for any accounts that you migrate. This is not explained in the Wiki doc. Configuring the Zimbra server as the secondary is described perfectly in the document.