Help with Mail Server

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http://ubuntuforums.org – Hi there, We have purchased a business and as part of that deal was given their email server (which is running Ubuntu Linux 8.04.3). I have updated the IP settings since we changed service provider but no emails seem to be coming in. The guy who set up the server left the below notes for the previous owners: "The server uses fetchmail to receive email from pop servers, then strips the form header and pipes them straight back into SMTP server (Postfix) with the original form header." Now this doesn't mean that much to me but from what I can tell Fetchmail is getting the emails as (Hardware)