I can't send mail from an Exchange 2007 mailbox to an Exchange 2013 mailbox. Any ideas ?

I have recently installed a server with Microsoft Exchange 2013 alongside our existing Exchange 2007 server as a first step in migration.  We have a single site, single AD, and just these 2 Exchange servers.  I believe I have followed all the Microsoft instructions for setting this up.  I have not yet migrated any mailboxes across.

To test it out I have created a new user with a mailbox on the 2013 server. From this, I can send email to the Internet successfully, but I cannot send email to a mailbox on the 2007 server.  I see no error message in Outlook, it appears to have sent it but it does not arrive.

It does work the other way round - i.e. From the user / mailbox on the 2007 server, I can send email successfully to the user with the 2013 mailbox.

I can't see how to troubleshoot sending mail between the exchange servers.  Please can you suggest where I can look?

Thanks
junaidabcAsked:
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R--RCommented:
Please telnet to port 25 from exchange 2013 to exchange 2007. Also check if the Exchange 2013 server IP is allowed in the Exchange 2007 receive connector. Also check the Exchange 2013 queue for errors.
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junaidabcAuthor Commented:
Thanks very much for pointing me in the right direction.  With hose test I found that it was a permissions error on the receive connector which is now resolved.
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R--RCommented:
Hi,

I am glad my suggestion assisted you to resolve the issue.
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