The original message was received at Mon, 22 Aug 2016 10:52:34 +0530 from 213.7.194.154 ----- The following addresses had permanent fatal errors ----- keycloak-user(a)lists.jboss.org ----- Transcript of session follows ----- ... while talking to host 135.76.87.185: 554 5.0.0 Service unavailable; [212.35.236.161] blocked using bl.spamcop.net, reason: Blocked Session aborted, reason: lost connection