unwise filtering policy from cox.net

if anyone from cox.net is reading... ----- The following addresses had permanent fatal errors ----- <abuse@cox.net> (reason: 552 5.2.0 F77u1Y00B2ccxfT0000000 Message Refused. A URL in the content of your message was found on...uribl.com. For resolution do not contact Cox Communications, contact the block list administrators.) This seems a rather unwise policy on behalf of cox.net -- their customers can originate scam emails, but cox.net abuse desk apparently does not care to hear about it.