When using MailMerge from Word using HTML, the email does not send or user experiences word freezing problem.
DLP Endpoint Release : 15.8 MP1
This is a product defect caused due to a conflict when Print Monitoring channel is ON.
The issue has been fixed in Public Hotfix 15.8.00109.01003 released on Nov 03, 2021 which can be downloaded from the Broadcom support portal (https://support.Broadcom.com/Downloads)