Inbound mail queue not delivering to mailboxes Exchange 2016

snooflehammer
snooflehammer used Ask the Experts™
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All of a sudden, no mail being delivered. Mail steadilly building in the inbound queue. Internal mail OK. Sending external mail OK.

I can't see any reason for the queue not to deliver to the mailboxes.

Any suggestions
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Author

Commented:
Update: I have the error 432 4.3.2 STOREDRV.Deliver ; dynamic mailbox database throttling limit exceeded

I can't find a resolution. No mail is being delivered to mailboxes
Check your server processer and RAM utilization control. Also check your event viewer if get any error message regarding exchange throttling limit exceeds.

Author

Commented:
T runs out it was a failing drive array, even though the HP ACU did not show a degraded state.

Moved the edb file & logs to a new array and promblem fixed.
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still you are facing issue then share event log or run Exchange BPA see and troubleshoot accordingly.

Author

Commented:
Found the issue myself & resolved
Found a couple of referneces in the logs to long write times to the edb, so I moved it to another array

Author

Commented:
Founf the answer through my own research

Commented:
For those of you that are facing the same issue and have confirmed it is not storage related, I had a client on 2016 CU2 for over 2 years with no problems.  Then all of a sudden, delayed emails everyday for weeks.  Turned out upgrading to .NET 4.7.1 and then Exchange 2016 CU10 resolved the issue with email delays.  I was pretty shocked.

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