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.