hotmail.com live.com admin needed

["Carlos M. Perez" <cperez () runcentral com>]

Hi,

We're trying to resolve some delivery issues reported by hotmail users.
Started happening a few weeks ago.  Getting immediate NDRs, and the
server that is supposed to receive the email has no records of
attempts.  The messages also don't match what the receiving server
should be sending.  The server(s) listed in the MX should receive all
email without authentication, since it's a mail filtering service (Maxmail)

===
Reporting-MTA: dns;snt0-omc3-s27.snt0.hotmail.com
Received-From-MTA: dns;SNT133-W53
Arrival-Date: Mon, 22 Oct 2012 14:09:49 -0700

Final-Recipient: rfc822;administrator () xxxx com
Action: failed
Status: 5.5.0
Diagnostic-Code: smtp;550 authentication required
===

Kindly contact me off-list.

Thanks,

--
Carlos M. Perez
Runcentral, LLC