The original message was received at Thu, 1 Oct 2009 00:14:28 -0400 from 127.223.60.134 ----- The following addresses had permanent fatal errors ----- <jboss-development(a)lists.jboss.org&gt; ----- Transcript of the session follows ----- ... while talking to 73.155.103.253: 550 5.1.2 <jboss-development@lists.jboss.org>... Host unknown (Name server: host not found)