Exchange 2010 receive messages threshold

Does some know what is exactly the threshold on Exchange 2010 to stop receiving emails when disk space is near to full.

I explain, last week i attended a customer issue related they were not able to receive emails (but they were able to send). Disk space was almost full, but it had 600Mb free. I´m supposing Exchange manages some threshold to stop receiving and avoid quick full disk problem, and allows users to send emails. It looks good, because services stay running and users don´t get errors.

After defragmentation of a small database i got 1.2 Gb free and users were able to receive emails.

Now, i need to inform my client what is the threshold used by exchange to stop receiving, i need to document it on my service report.


My need now is to fill a report of my service, and i
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Britt ThompsonConnect With a Mentor Sr. Systems EngineerCommented:
This site explains all the back pressure actions by Exchange and how to configure them:
Vipin VasudevanConnect With a Mentor Associate Infrastructure SpecialistCommented:
Do you have seperate servers for Mailbox and HUB and CAS server. if yes this will happens. you can refer "renazonse" comment for more details. then yu wuill understand why it is so.
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