Right after someone signs up, I get over a dozen bounced emails back from my dedicated server that say this for every one--even with confirmed and valid emails:
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"Mail failure - no recipient addresses"
A message that you sent contained no recipient addresses, and therefore no
delivery could be attempted.
------ This is a copy of your message, including all the headers. ------
To:
Subject: =?UTF-8?B?TWF0Y2ggTm90aWZpY2F0aW9u?=
Content-type: text/html; charset=UTF-8
MIME-Version: 1.0
From: =?UTF-8?B?TXVza2Vnb24uY29t?= <admin@mysite.com>
Message-Id: <E1MfkrK-00049M-1d@ip-xx.xx.xxx.xx.ip.myserver.net>
Date: Mon, 24 Aug 2009 21:30:02 -0400
<html><head></head><body style="font: 12px Verdana; color:#000000">
<p><b>Hello picklesmynickle</b>,</p>
<p>We are glad to inform you that a profile was added or modified at http://www.mysite.com/ that matches yours.</p>
<p>Match profile:<span style="color:#FF6633"><a href="http://www.mysite.com/username">http://www.muskegon.com/newusername</a></span></p>
<p>Your Member ID:<span style="color:#FF6633">40</span></p>
<p>--</p>
<p style="font: bold 10px Verdana; color:red">Muskegon.com mail delivery system!!!
<br />Auto-generated e-mail, please, do not reply!!!</p></body></html>
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note: identifiable information was removed from this email for security purposes.