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Mail Server configuration for only LAN transfer?

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http://www.linuxquestions.org – Hey everyone, I'm attempting to create a Mail server and have been doing a little bit of research for the past week. I haven't had much luck with it. I only need the mail server to be able to send mail over a LAN from the server to other host computers on the network. I've been attempting to learn PostFix but everything I read about it, everyone seems to be mentioning registering to a DNS service. Can I skip having to setup a DNS service and use the host file on the server, and then point the MUA on the host computers point to the IP address of the server? (Using Evolution as the MUA) than (HowTos)