O365 Exchange - MAILS ARE ALWAYS RECEIVED AS PLAIN TEXT INSTEAD OF HTML FORMAT

[Marvin Oco]

We have a user where MAILS from user@contoso.com ARE ALWAYS RECEIVED AS PLAIN TEXT INSTEAD OF HTML FORMAT.

other users receives the mails from user@contoso.com HTML

mails sent by user@contoso.com are in HTML

Read all standard mail in plain text is unchecked

We are using MAPI

Any known issue / fix?

[#2]

If this happens to a single user only, have them delete any contact entries matching the sender's address, and clear their autocomplete cache.

[#3]

@Marvin Oco 

Hi, hope that you have already found a solution for your issue.

After searching the internet inside out for more than 12 hours, this fixed it:

Set-RemoteDomain Default -TNEFEnabled $false

Details: https://gcits.com/knowledge-base/how-to-fix-the-winmail-dat-attachment-issue/

The post is old, but I still got the same issue in 2020, and it is not well-explained by MS, hope my reply makes life easier for someone :)

[#4]

I keep getting "The term 'Set-RemoteDomain' is not recognized as name of a cmdlet(...)" Mensage even after retracing and copy-pasting all steps. Anyone had that problem?