[ubuntu] E-Mail won't send to other (internal) server, Postfix and /etc/hosts

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http://ubuntuforums.org – Hey Every1! I'm running two Ubuntu 12.04 servers here and they both are installed fine and dandy, running all services. They both are connected to the same router with two different outside IP's (through 1-on-1 NAT). They have similer inside ip's (server1:, server2:; I have my hosts setup correctly so that the servers should go to their other respective internal ip's and that works when i need to call to the other servers in PHP, but not when i try to send mail from one e-mail address on server1 to another e-mail address on server2. In my mail.log: Aug 23 11:46: (Hardware)