Hi,

Is there any way to disable Duplicate Message Detection?

please refer the below link

https://social.technet.microsoft.com/Forums/en-US/a223ec24-e4ac-4a14-8a72-74767a050787/exchange-2013-duplicate-message-detection?forum=exchangesvrgeneral

Regards

John

• Proposed as answer by Johnpaul J Tuesday, March 03, 2015 5:54 AM

Thanks for your reply,

I see this article but I don't have these keys in registry should I create them?

Sorry I'm new in Exchange and I'm afraid

Thanks

Hi,

By default, these registry keys doesn't exist, so we need to create these keys.

1. Right-click <Private/Public-Guid>, point to New, and then click DWORD Value.
2. Type Track Duplicates, and then press ENTER to name the new value.
3. Right-click Track Duplicates, and then click Modify.
4. In the Value data box, type the value 1, in hours, that you want to keep received message information, and then click OK.
5. Repeat the same steps to create Background Cleanup key.

Best Regards.