You are getting into serious stuff here because this is more than just mailserver parameters. The address bgnet.bgsu.edu is a registered address with a specific dns number allocated by the www.
This is so that mail servers throughout the internet know where to direct mail. Take a look at the header for the email that notified me about your response;
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for <email@example.com>; Sat, 15 Nov 2003 21:32:10 +0000
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Date: Sat, 15 Nov 2003 16:32:09 -0500
Subject: Reply to post 'Email and Kmail'
From: "LinuxQuestions.org Mailer" <firstname.lastname@example.org>