Exchange 2013 - Duplicate Message Detection

Hi,

I am trying to resend an email from my spam firewall but it is not reaching the user. The duplication detection on the server is not allowing me to resend. If I go back older than a month I was able to successfully resend from the spam firewall. 

How do I temporally disable the duplicate message detection on Exchange 2013 server?

I found this from someone else for 2013 but I did not have this path in my registry:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\<Server_Name>\Public-<GUID>

Thank you