Undelivered Message from Exchange 2010

Hi,

We are in process of migrating a user from Exchange 2003 to Exchange 2010. recently facing an issue , when a user from exchange 2010, sending a email to one of the Exchnage 2003 user mailbox , we received a ndr as below.

#< #5.6.1 smtp;554 5.6.1 Body type not supported by Remote Host> #SMTP#

Forwaring has been enable to One External contact for which we gets thsi NDR, no issue for Exchange 2003 user.

Any idea why this happen.

Note : When I tried to send email to that external contact from exchange 2010, no issue found, only in case of forwarding its not works.
padas6Asked:
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padas6Connect With a Mentor Author Commented:
Hi,

Issue has been resolved after move the user to Exchange 2010 platform.

Now everything is working without an issue.
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Simon Butler (Sembee)ConsultantCommented:
Usual cause of this is SMTP interference. Is there a firewall between the servers? AV software scanning the SMTP traffic? Also ensure the FQDN on the SMTP virtual server on the Exchange 2003 server matches the server's real name.

Simon.
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padas6Author Commented:
One thing I want to share , we are using DLP for for message compliance, we suspect that might be cause, but I do not have much information on the device. suspect that might be cause of this issue.

But if the user hosted on Exchange 2010, no issue for delivery email.
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padas6Author Commented:
Issue has not been identifed , however moving the user from Exchange 2003 to 2010, now user is able to send a mail to external ID ( Contact) without an any issue.
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