This may not be the way to go about this, but have you verified that both domains are in the qmail/control/locals file?
Don't put vpopmail domains in control/locals. You'll mess things up.
There isn't a known solution to what was asked. Doublebounces go to the postmaster of the server. Bounce messages refer to the name of the physical server, and not the domain name.
You might be able to modify qmail-send, but it would be very difficult to determine what hostname to use in the bounce message.
What if there are multiple recipients that bounced?
What if it's a message one of your user's is trying to send to a hotmail address? You don't want it to say that your server is hotmail.com.
For debugging purposes, it's best to have the server use it's real name. You can adjust that by editing control/bouncehost and setting it to a single name.
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