I am not sure if I understood what is not capable of Squid. You mean that use Squid to hide the client IP sender is not possible? This is the goal, the first message at serverfault is mine: http://serverfault.com/questions/212333/how-to-hide-the-client-ip-sender-and-show-only-the-smtp-server-ip -- View this message in context: http://squid-web-proxy-cache.1019090.n4.nabble.com/Can-squid-be-configured-as-SMTP-SMTPS-proxy-tp2727188p3093474.html Sent from the Squid - Users mailing list archive at Nabble.com.