http://support.microsoft.com/kb/555375

Ed Crowley MCSE+Internet MVP
Freelance E-Mail Philosopher
Protecting the world from PSTs and Bricked Backups!T

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of titanic
panic
Sent: Monday, January 15, 2007 10:33 PM
To: Exchange Discussions
Subject: help with an NDR message

Exch 5.5 SP4

Can someone please explain where I should look to fix this error message.
Is it a client-side problem?  I think the user is on a Mac:


------------------------------
Your message did not reach some or all of the intended recipients.

      Subject:  RE: due on 2/4/07
      Sent:     Fri, Jan 12, 2007 8:03 PM

The following recipient(s) could not be reached:

      c=US;a= ;p=Inc;o=NY;dda:SMTP='[EMAIL PROTECTED]'; on Today, 7:36 PM
            The recipient name is not recognized
        The MTS-ID of the original message is: c=US;a=
;p=Inc;l=SERVER-070116033417Z-18070
            MSEXCH:IMS:Inc:NY:MALCHUT 3501 (000B09B6) 501 5.5.4 Syntax error
in parameters scanning
------------------------------

I tried to telnet to port 25 of the domain's MX record but got this and this
what happened when i tried to type "HELO":

220 smtp.siteserver.net ESMTP SecureSMTP v8.0; Mon, 15 Jan 2007 22:30:23
-0800 h500 5.5.1 Command unrecognized: ""
e500 5.5.1 Command unrecognized: ""
lo500 5.5.1 Command unrecognized: ""
500 5.5.1 Command unrecognized: ""

Is it a simple unknown recipient or is the recipient's mail server messed
up?

Thanks for any help,

Joon

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