I had a secondary mx server configured. after upgrading the latest ispconfig version the secondairy mx start failing with relay access denied. Maybe i didnt configure the secondary server correctly the first time, but it worked! I would like to know the correct way to do this is a global way instead of adding all the domains. Its been a while that i configured the secondary mx, but i remembered changing the mysql-virtual_relaydomains.cf etc login to the mainserver.
