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Also tell me what is the last error showing in the Queue viewer for the queue where mails are stuck?
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Also tell me what is the last error showing in the Queue viewer for the queue where mails are stuck?

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Morning Experts,<br />
<br />
I have added an Exchange 2010 server to our environment. &nbsp;All mail is routing through our Exchange 2007 server.<br />
<br />
Users on 2007 can send to users on 2007 but not to 2010<br />
Users on 2010 can send to users on 2010 but not to 2007<br />
Users on 2007 can send and receive external email<br />
Users on 2010 can send external email but not receive<br />
<br />
I know this is a connector issue but not quite sure what connectors I need and permissions to go on them.<br />
<br />
Thanks in advance for any assistance.
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Morning Experts,

I have added an Exchange 2010 server to our environment.  All mail is routing through our Exchange 2007 server.

Users on 2007 can send to users on 2007 but not to 2010
Users on 2010 can send to users on 2010 but not to 2007
Users on 2007 can send and receive external email
Users on 2010 can send external email but not receive

I know this is a connector issue but not quite sure what connectors I need and permissions to go on them.

Thanks in advance for any assistance.

Routing email between Exchange 2007 and 2010

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.