Exchange 2010 back pressure

Does back pressure on Exchange 2010 occur when the volume where the mailbox database is stored or only on the application volume where the queue and/or the location of the Exchange install?  I only have 30 GBs out of 330 GBs available on my mailbox drive (not the same as the c: drive) and outside emails are not processing.  Wouldn't back pressure make all emails not process?
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Nick RhodeIT DirectorCommented:
Where the Queue resides (default path ExchangeInstallPath\TransportRoles\data\Queue).  Backpressure would cause stop recieving incomming messages.  Here is an article to explain it.  If your scroll down to 'Actions taken by Exchange Transport you will see what it stops when it hits a certain level.

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gopher_49Author Commented:
It ended up being GFI MailEssentials...  After reading your post I knew that wasn't my problem for that drive has plenty of free space.

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