Fixing Winmail.dat problem on Office365

2022/12/30 2022/5/28

Office365 has a problem in that by default it sends messages in TNEF format. This format can’t be read by a lot of other email systems, so it’s a bit of a daft choice.

This video shows you how to fix this, so that Office365 doesn’t send in this format to people who are outside your organisation.

The commands you need to cut and paste as shown in the video are:

set-executionpolicy unrestricted

$LiveCred = Get-Credential

$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https:–ps.outlook.com-powershell- -Credential $LiveCred -Authentication Basic -AllowRedirection

Import-PSSession $Session

Set-RemoteDomain Default -TNEFEnabled $false