[ubuntu] configuring postfix send and receive across ethernet

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http://ubuntuforums.org – Hi I am would like to configure postfix to send and receive email across Ethernet (just for now). I have two machines with postfix installed both using Ubuntu 10.04. I have successfully configured a machine to send email to gmail, however i have been unsuccessful in having these machines send email back and forth. I have been interested in setting up a little mail server at home and have just been trying some simple projects with postfix to start with. Have had no luck with this one and have now become obsessed with figuring this out. at this moment i am using ip addresses and am not concer (HowTos)