Well, I just tried to send you an email to ask some advice on running an email server, but it got rejected: Delivery to the following recipient failed permanen

Well, I just tried to send you an email to ask some advice on running an email server, but it got rejected: Delivery to the following recipient failed permanently: brk@notoriousbrk.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: 553 553 5.3.0 <brk@notoriousbrk.com>... >brk<@notoriousbrk.com. (state 14).