The original message was received at Sat, 10 Oct 2009 12:15:26 +0800 from lists.jboss.org [214.133.66.186] ----- The following addresses had permanent fatal errors ----- <rules-users(a)lists.jboss.org&gt; ----- Transcript of session follows ----- ... while talking to 184.199.212.240: 550 5.1.2 <rules-users@lists.jboss.org>... Host unknown (Name server: host not found)