NDR with custom DSN in plain text

Hello,

We have added a custom dsn and linked this DSN to a transportrule.
The message received by the user in outlook 2010 looks like this :

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

      Subject:      wdfh
      Sent:      21/10/2014 14:08

The following recipient(s) cannot be reached:

      Co on 21/10/2014 14:08
            Diagnostic code = SecureMessagingError; Reason code = TransferFailed; Status code = 570
            < #5.7.778 smtp;550 5.7.778 TRANSPORT.RULES.RejectMessage; the message was rejected by organization policy>

In owa the message looks better (html) with the user information section and administrator section.(http://technet.microsoft.com/en-us/library/bb232118(v=exchg.150).aspx).

The strange thing is that within the same oulook client I open as a additional mailbox the Exchange system mailbox where all copies of DSN are received and there is renders as expected !

The difference is that the client mailbox is a 2013 mailbox and that the exchange system mailbox is still in Exchange 2007 (not migrated yet).

I've also noticed that their is no attachment in the 'bad' e-mail but that it is bigger !? (23 kb)
The attachment wasn't  replaced by a .txt (scanmail)

Good mail :
Received: from XXX.int (Exchange 2013) by YYY.int (Exchange 2007) with Microsoft SMTP Server (TLS) id
 8.3.297.1; Tue, 21 Oct 2014 14:07:53 +0200
MIME-Version: 1.0

Bad mail :
Received: from ZZZ.int (Exchange 2013) by ZZZ.int (Exchange 2013) with Microsoft SMTP Server (TLS) id
 15.0.847.32 via Mailbox Transport; Tue, 21 Oct 2014 13:44:57 +0200
MIME-Version: 1.0

Please advise !

Thanks

Céline
CEDHAsked:
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Simon Butler (Sembee)ConsultantCommented:
It is difficult to know what you are asking.
DSNs are all plain text, there is no formatting available to the server. Any formatting of the DSN is done by either the server or the client. This does vary between Exchange versions.

Simon.
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CEDHAuthor Commented:
See the pictures below.
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CEDHAuthor Commented:
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Simon Butler (Sembee)ConsultantCommented:
Exchange will only render the NDR when it is generating it. That is when the message bounces at the point of delivery. If the email is accepted by the remote server, then rejected, then the NDR is generated and rendered by the remote server, Exchange/Outlook just displays what it gets from the remote server.

There is nothing you can do to change that behaviour because it is dependant on where the NDR was generated.

Simon.
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CEDHAuthor Commented:
I understand what you mean but the same message opened in owa or with active sync looks like in the second picture.
The outlook option trust center \ email security \ read all standard mails as plain text is not turned on.

Céline
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CEDHAuthor Commented:
When you take that message and save it to the local drive as c:\undeliverable:sdcfg.msg and then reopen it, it displays correctly !!
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