Mailing List Message #92870
From: Hisham Al Saad <>
Subject: Hotmail issue
Date: Mon, 08 Oct 2007 06:31:21 -0700
To: <CGatePro>
X-Mailer: Microsoft Office Outlook 12.0



One of our hosted customers when ever tries to send email to Hotmail, his messages bounces with below reply. He is connecting from a dynamic IP, however we have many customers connecting the same way with no problems.


> This message was created automatically by mail delivery software.


> A message that you sent could not be delivered to all of its recipients. The

> following address(es) failed:




> The reason for failure was as follows:


> 550 Mail rejected by Windows Live Hotmail for policy reasons. We

> generally do not accept email from dynamic IP's as they are not typically

> used to deliver unauthenticated SMTP email to an Internet mail server.

> maintains lists of dynamic and residential IP

> addresses. Contact your ISP to determine which authorized SMTP relay servers

> to send your mail through (or) request a static and dedicated IP before

> attempting to send mail. For additional information about Microsoft's

> technical guidelines, please refer to:



Any hints please what causes this.


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