The e-mail header is all the information used to address the e-mail, as well as say who the sender was, and what route it travelled to get to you.
For example, this is the header from a piece od SPAM I just received:
Return-Path: <[email protected]> X-Spam-Checker-Version: SpamAssassin 3.1.0 (2005-09-13) on lindy.vogon.net X-Spam-Level: X-Spam-Status: No, score=-2.5 required=3.5 tests=BAYES_00,HTML_50_60, HTML_MESSAGE,SPF_HELO_PASS,SPF_PASS autolearn=ham version=3.1.0 Received: from bigfootinteractive.com (arm97.bigfootinteractive.com [216.35.62.97]) by lindy.vogon.net (8.13.4/8.13.4) with SMTP id k2RNUwDA030899 for <[email protected]>; Mon, 27 Mar 2006 15:30:59 -0800 Reply-To: discovercard.W2TH054F458C5A42FB232328ED4950@email.discovercard.com Bounces_to: [email protected] Message-ID: <W2TH054F458C5A42FB232328ED4950.635.1254.drmailer10.DumpShot.4@email.discovercard.com> X-BFI: W2TH054F458C5A42FB232328ED4950 Date: Mon, 27 Mar 2006 18:19:01 EST From: Discover Card <[email protected]> Subject: Your opportunity to learn about valuable Account services To: [email protected] MIME-Version: 1.0
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The important part for replying is a header called
From: ......
or
Reply-To: .....
(Reply-To: has precendence over From:).
Make certain that the address specified there is correct, not mangled in some way.
When the mail bounces baqck to you, what does it say -- most mailers give a reason for returning mail.