Exchange 2010 EdgeTransport BackPressure issue

Hi guys, so starting yesterday morning our mail server was maxing out the cpu with the EdgeTransport.exe service. Memory was also being maxed out (16GB). I'm pretty sure this is a backpressure issue so I've disabled the Exchange monitoring for now and restarted the edgetransport service. However I know this is only a temporary meausre as I see the CPU is back up along with the memory. Why is there so much "pressure" on my mail server? Normally its just idling along. We're only maybe 200 mailboxes. Any ideas?

I should note that all drives on the server have LOTS of drive space - 50% used at the moment

We also have a Barracuda that filters and queues the mail as it starts to get backed up so I don't think spam is the issue. Queue viewer in exchange only shows a handful of messages

Update: Mail.que file has gone from 4GB this morning (9am) to 10.5GB now (11:30am)

There's no mail in the queues (well maybe 4 or 5 messages) - outbound mail is queuing up on the Cuda.
ITGeneralAsked:
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AmitIT ArchitectCommented:
Any patching done recently? Windows or Exchange or hardware related. If you have any OS level AV or monitoring tool on this server disable it and monitor for some time. Here is an excellent article to troubleshoot this issue
http://exchangeserverpro.com/exchange-transport-server-back-pressure/

Can you also tell, which process in task manager using maximum CPU and RAM.
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ryanlochheadCommented:
I have had issues like this on 2013 with IIS and had to limit the usage may be worth a look.
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ITGeneralAuthor Commented:
Looks like it was a corrupt queue. My boss re-built the queue over the weekend and things seem to be back to normal at this point.
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AmitIT ArchitectCommented:
check system logs for any disk errors and make sure exchange binaries are folders are excluded from OS level AV.
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