After ADMT Migration Exchange Loop

Hi,

I have an Active Directory 2003 with an Exchange 2003. I configured a new AD 2008 with an Exchange 2010.

With prepare-move-mailbox I created the MEU and with move-mailbox I successfully moved the mailbox from the old organisation to the new organisation.

After that the Mailing is working well, the old Exchange sends the mail correctly to the new Exchange.

Now I synced the MEU wit the User from the old AD via ADMT. After that the Mails going into an loop and couldn't delivered to the Mailbox.

I think I must exclude some Attributes from the ADMT Migration. I Excluded all Exchange Attriibutes but the problem persists...