432 4.3.2 STOREDRV.Deliver; recipient thread limit exceeded exchange 2016

Occasional Contributor

Hi Guys, 

 

Recently I am getting 432 4.3.2 STOREDRV.Deliver; recipient thread limit exceeded on my exchange server 2016 and internal email are stuck in queue for a long time. Eventually the email will be delivered to mailbox but it take times like 1 or 2 hours. 

 

I googled around and does not fund anything specific on this error. 

 

Seeking some advice, what shoul

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