On Mon, Nov 8, 2021 at 11:34 PM, Bruce Bowman wrote:

Outlook inserts a winmail.dat file in virtually every outgoing message. Only other Outlook clients do anything with it.

I understand that these are generated when the Sender is using Rich Text Format and the answer would seem to be to switch to HTML or Plain Text. <https://gcits.com/knowledge-base/how-to-fix-the-winmail-dat-attachment-issue/>https://gcits.com/knowledge-base/how-to-fix-the-winmail-dat-attachment-issue/