This just started happening two days ago.  At first I got Delivery Status Notification (Delay) messages and eventually Delivery Status Notification (Failure)‏ messages to known good email addresses I sent to in previous days.  The following is the header to the last Delivery Status Notification (Failure) msg received.

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x-store-info:D6taffyBScEUZsL+ZXbbDoZx0yi5SZysLYNZkkAn2qDeerwc2zE4rj6AQtkc/kxYUomGNdDenLkoCp4wUTTdrssi1CcLP/rb3t6X1UQs7hDn/nxD+pUrTn31FWR2ELNzrhzLwd6JmSA=
Authentication-Results: hotmail.com; spf=none (sender IP is 157.56.23.13) smtp.helo=col0-wss1-s6.col0.hotmail.com; dkim=none header.d=mail.hotmail.com; x-hmca=none header.id=*** Email address is removed for privacy ***
X-SID-PRA: *** Email address is removed for privacy ***
X-AUTH-Result: NONE
X-SID-Result: NONE
X-Message-Delivery: Vj0xLjE7RD0wO0dEPTA7U0NMPTk7bD0x
X-Message-Info: AuEzbeVr9u5fkDpn2vR5iCu5wb6HBeY4iruBjnutBzpStnUabbM/X3OHG1tkHI7a3kMiU15mwZkdItk0fkPUd26iJME4hbgAI/g6pso0Zyh7O0XVOq5g8hCf8Efy9J5lKkdwprP9EhP7RM0PyiUzXIPU4Cw0bszt
Received: from col0-wss1-s6.col0.hotmail.com ([157.56.23.13]) by COL0-MC3-F6.Col0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4900);
	 Sun, 8 Sep 2013 16:07:45 -0700
From: *** Email address is removed for privacy ***
To: *** Email address is removed for privacy ***
Date: Sun, 8 Sep 2013 16:07:45 -0700
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
	boundary="9B095B5ADSN=_01CEA53E5F83EDBD001B6708col0?wss1?s6.col"
X-DSNContext: 7ce717b1 - 1386 - 00000002 - C00402D1
Message-ID: <*** Email address is removed for privacy ***>
Subject: Delivery Status Notification (Failure)
Return-Path: <>
X-OriginalArrivalTime: 08 Sep 2013 23:07:45.0310 (UTC) FILETIME=[3A6F83E0:01CEACE8]
This is a MIME-formatted message.
Portions of this message may be unreadable without a MIME-capable mail program.
--9B095B5ADSN=_01CEA53E5F83EDBD001B6708col0?wss1?s6.col
Content-Type: text/plain; charset=unicode-1-1-utf-7
This is an automatically generated Delivery Status Notification.
Unable to deliver message to the following recipients, due to being unable to connect successfully to the destination mail server.
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Due to privacy I did not include the recipients email addresses in the copied header info.

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