Unrachable domain queue

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    Has anyone seen the issue where email to an internal relay 2003 exchange server goes to the unreachable domain queue. I have read a few things about it today. MS and I are trying to TS but unfortunately no solution yet.

    We have two 2007 exchange hub transport servers. We also have two 2003 exchange servers.

    This worked until I tried modifying RGC connectors in powershell according to documentation to use both hub servers rather than favoring just the 2007 hub in my site. I can send email from both 2003 servers to both 2007 servers. I can only send email from 2007 to one of the two 2003 servers. All email for the other one goes to the unreachable domain queue. I can send mail from 2007 server to 2003 using telnet so I am assuming this is not an SMTP issue. I have tried deleting and recreating routing group connectors as I had at start and the problem still persists.

    Does anyone have any ideas?

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