Exchange 2010: 432 4.3.2 STOREDRV.Deliver; recipient thread limit exceeded

Here again a small guide to fix the following error:

432 4.3.2 STOREDRV.Deliver; recipient thread limit exceeded

The error often occurs in Exchange 2010 with journal mailboxes or databases that store a journal mailbox. The above-mentioned error can occur especially with journal mailboxes with a high load.

Here it can help to increase the maximum simultaneous threads per mailbox and database. To do this, the following two lines must be added to the "EdgeTransport.exe.config" file:

<add key=“RecipientThreadLimit“ value=“2″ />
<add key=“MaxMailboxDeliveryPerMdbConnections“ value=“3″ />

The EdgeTransport.exe.config file is located under the following path:

C:\Program Files\Microsoft\Exchange Server\V14\Bin\EdgeTransport.exe.config

Attention: There are 2 files with similar names in the directory.

After the change, the "Microsoft Exchange Transport" service must be restarted. The default setting for RecipientThreadLimit is 1 and MaxMailboxDeliveryPerMdbConnections is 2. It is not recommended or supported to set the values even higher.