forwarding loop with usernames with @


I have a problem in Postfix with usernames in the form user@domain. Having set a .forward from Usermin including the "Normal user mailbox" option, I receive the following email back when trying to send messages to that address:

Final-Recipient: rfc822;
Original-Recipient: rfc822;
Action: failed
Status: 5.0.0
Diagnostic-Code: X-Postfix; mail forwarding loop for

The .forward looks like that:

"|/etc/usermin/forward/ /home/domains/"

I tryied editing the first line manually to:

and the message gets delivered properly.
Am I missing some settings?
If not, that's a bug and it could be fixed letting Usermin automatically generate a "Normal user mailbox" like I did.

Please let me know...

Closed (fixed)