Undelivered Message from Exchange 2010


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.
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padas6Connect With a Mentor Author Commented:

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

Now everything is working without an issue.
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.

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.
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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