Gmail App : Recipient address rejected: User unknown in virtual mailbox table

[Unkaiser]

Hello.

I used ispCP Omega 1.0.6, Ubuntu 8.04.4.

Example ispCP Host. I used mail: test@abc.com is a Normal Mail.

But test@def.com is a Gmail App. Domain name "def.com" created by ispCP.

The problem is test@abc.com can not send mail to test@def.com

Error occurred.
Server error: '550 5.1.1 <test@def.com>: Recipient address rejected: User unknown in virtual mailbox table '.

How to config both of "Normal Mail" and "Gmail App" for ispCP host ?

Sorry for bad English.