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-gmail.com is listed in postmaster.rfc-ignorant.org (Not supporting
550 address@hidden) (state 14).
Is this an error in the bug tracker, or is there a way for me to fix this?