In your case, it is definitely the "asshole" status.
From: Bill Polhemus <bill@polhemus.cc>
To: seaint@seaint.org
Sent: Tuesday, August 11, 2009 11:27:41 AM
Subject: Re: List errors - still
I wonder. I know that some email server installations still relegate certain domains or IP ranges to "blackhole" status. Could that be what is happening?