Fix winmail.dat email issue, disabled TNEF for Office 365

How to stop Office 365 sending winmail.dat attachments to a non Microsoft mail client (Mac mail or Thunderbird for example). This is often due to Office 365 or Exchange sending emails in a proprietary format named TNEF (Transport Neutral Encapsulation Format) that only other Microsoft clients accept. This can be disabled for your tenant via […]

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