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two things<br />
<br />
1. What account are you using for login account for your exchange services? it should not be domain account but network service account<br />
<br />

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two things

1. What account are you using for login account for your exchange services? it should not be domain account but network service account



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we do not have problem ! one user from another company that wants send mail to my user have problem , in fact he is a domain user and his mail sent from MS Outlook . <br />

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we do not have problem ! one user from another company that wants send mail to my user have problem , in fact he is a domain user and his mail sent from MS Outlook .


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I understand ..however this is most probably because the configuration issues at E2K7 side.
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I understand ..however this is most probably because the configuration issues at E2K7 side.

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<div class="content wysiwyg-content">
recently one senders from outside sent one email to one of my users &nbsp;in my server (our server is exchange 2007 and sourece server is exchange 2003 ) he receive following NDR :<br />
do you know why he receive this NDR ? <br />
<br />
Your message did not reach some or all of the intended recipients.<br />
&nbsp; &nbsp; &nbsp; Subject: &nbsp;FW:<br />
&nbsp; &nbsp; &nbsp; Sent: &nbsp; &nbsp; 1387/11/19 04:45 (.8<br />
The following recipient(s) cannot be reached:<br />
&nbsp; &nbsp; &nbsp; myuser@domain1.com on 1387/11/19 04:46 (.8<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; A critical function required for the transfer or delivery of the message was not supported by the originator of the report<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;Mail.domain2.com #5.3.3 smtp;500 5.3.3 Unrecognized command&gt;<br />
<br />
B.M
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recently one senders from outside sent one email to one of my users  in my server (our server is exchange 2007 and sourece server is exchange 2003 ) he receive following NDR :
do you know why he receive this NDR ? 

Your message did not reach some or all of the intended recipients.
      Subject:  FW:
      Sent:     1387/11/19 04:45 (.8
The following recipient(s) cannot be reached:
      myuser@domain1.com on 1387/11/19 04:46 (.8
            A critical function required for the transfer or delivery of the message was not supported by the originator of the report
            <Mail.domain2.com #5.3.3 smtp;500 5.3.3 Unrecognized command>

B.M

why I receive NDR?

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.