A user reported that the HTML part of the body is broken if he enables signing of emails. The problem doesn't appear when he disables signing.

Here is a log file:

Installed version: Gpgwin 4.1.0

Enabled Add-ins beside GpgOL:

• Acrobat PDFMaker Office COM Addin
• Adobe Document Cloud for Microsoft Outlook - Acrobat
• Microsoft Exchange Add-in
• Microsoft SharePoint Server Colleague Import Add-in
• Microsoft Teams Meeting Add-in for Microsoft Office
• OneNote Notes about Outlook Items
• Outlook Social Connector 2016