Exchange 2010 Edge Transport server not sending emails to Exchange backend server

I noticed this morning that my Exchange 2010 Edge Transport server is not sending emails to my backend Exchange 2010 server (which hosts all remaining roles). Tyring to figure out what may be causing this issue.

Checked the event logs of both servers and nothing is being reported there that can help me. Performed message Tracking on both servers. The edge server reports that it is in fact "RECEIVE" emails from the backend Exchange server and is successfully sending them. However it reports that it is only "RECEIVE" external emails destined for the backend Exchange server (Internal users) but it shows now entry of even an attempt to "SEND" the emails destined to internal users.

My backend exchange server is working fine and is sending and receiving just fine for all internal users and is sending emails destined for external addresses to my edge server. But it is showing that no emails are being received from the Edge server.

What could be the possible cause of this?
dowhatyoudo22Asked:
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Gareth GudgerCommented:
Maybe one quick thing to try is to delete and recreate the Edge Subscription. You may want to review all the other points of this document to make sure everything else is still configured as expected. For example, any Windows Firewall changes.

http://exchangeserverpro.com/exchange-2010-edge-transport-server-configuring-edgesync/
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dowhatyoudo22Author Commented:
The problem turned out to be a space issue on the drive housing my exchange database. Although there was at least 7 GB free of a 250 GB drive the server stopped accepting emails from the edge server. After running a backup of the system I was able to free up 100GB of space and emails began to flow.

Thanks.
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dowhatyoudo22Author Commented:
There was only one response to my post and it didn't turn out to be the solution.
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