I performing cross-forest migration from Ex2003 to Ex2010, and I configured Shared SMTP namespace but when I send e-mails to a mailbox that migrated from Ex2003 to Ex2010 forest, I got the following error in E-mail:

A configuration error in the e-mail system caused the message to bounce between two servers or to be forwarded between two recipients. (NDR 5.4.6)

How can I solve this?

T

Hi

Will this KB help?

http://support.microsoft.com/kb/324732

"You receive an NDR with a 5.4.6 status code when you send a message to a specific domain in Exchange"

Cheers

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Hi Zi,

no, this KB don't help me. I applied everything mentioned in this KB, and nothing changes. any other ideas to share with me please? :)