Here is one from ATT that I know is legit. Not too sure of the differences:
From AT&T Online Services Mon Aug 12 16:48:09 2013
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Date: Mon, 12 Aug 2013 18:48:09 -0500
From: AT&T Online Services <
att-services.cn.1743094703@emaildl .att-mail.com>
To:
myemailaddress@swbell.net
Message-ID: <10806784.2166431376351289934.J avaMail.websphe@tsprd471>
Subject: Your AT&T online bill is ready to be viewed
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boundary="----=_Part_214352_3318752.13763512 89929"
Content-Length: 17751