Hello, How are you ? I have configured my multiserver by following this link: http://www.howtoforge.com/perfect-server-opensuse-12.1-x86_64-with-apache2-ispconfig-3 My servers are: web, mail and db. ISP config is showing all the servers. I can receive mail but cannot send mail to other domains. The Squirrel Mail showes the following error: Message not sent. Transaction failed Server replied: 554 5.7.1 Relay access denied What should I do to solve it... ? Thanks in advance.