Mail Forward / Hostlookup Issues

I have several domains on my server.

ABC.com
DEF.com
XYZ.com

These 3 domains have email hosted my google and everything works as expected there.

However, when I try and send email from a php form to an address at XYZ.com, my server tries to send it locally, instead of sending it to google's MX address. If I try and send mail from this php form to either ABC.com or DEF.com, it works great and sends it to google's MX servers.

I ran a email trace from within cpanel and it returned this:

asdf@XYZ.com
virtual_aliases via /etc/valiases/XYZ.com
|
|
|
-------- XYZ@myserver.com
localuser to local delivery

asdf@ABC.com
lookuphost via ASPMX.L.GOOGLE.com
The contents of my valiases files?

root@server [/etc]# cat /etc/valiases/XYZ.com
*: XYZ
root@server [/etc]# cat /etc/valiases/ABC.com
*: ABC
Here's some debug from the exim_mainlog file

2008-05-14 12:34:06 <= nobody@MYSERVER.com U=nobody P=local S=660
2008-05-14 12:34:08 => asdf@ABC.com R=lookuphost T=remote_smtp H=ASPMX.L.GOOGLE.com [209.85.147.27]
2008-05-14 12:34:08 Completed
2008-05-14 12:45:53 <= nobody@MYSERVER.com U=nobody P=local S=2611
2008-05-14 12:45:54 => XYZ <asdf@XYZ.com> R=localuser T=local_delivery
2008-05-14 12:45:54 Completed

Any ideas?