==== Required information ====
- iRedMail 0.8.3
- MySQL
- Debian 6.0
====
I have a problem with the mail server. I have two domains configured on my server, the first one works, but the second one doesn't, and when I try to send a mail I report the following problem:

Delivery to the following recipient failed permanently:

     admin@gamingnewsitaly.com

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 sorry, no mailbox here by that name (#5.1.1) (state 13).
How can I do in order to fix it?
Thanks