Well I just tried to contact the IRC guys to get the details but looks like their main email is not working....
Delivery to the following recipient failed permanently:
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
Tried calling but no one around to answer any questions. sigh