Prevent Outlook from sending winmail.dat files

Powershell:

Set-RemoteDomain Default -TNEFEnabled $false

Mail flow > Remote domains > Add Add icon, or select an existing remote domain, and then click Edit Edit icon > Use rich-text format section. Set to false.

This is caused by Microsoft encapsulating their emails with a thing called TNEF which makes non-Outlook clients struggle to read the emails.

Source 1

Source 2

Leave a Reply