Office 365 Message Encryption (OME) allows OWA users to revoke some messages after they are delivered to recipients. But if the message goes to Office 365 or Outlook.com, you can’t revoke it. And there’s the slight matter of needing an Office 365 E5 license too. Even so, it’s still nice to be able to revoke messages if they go to the wrong place.
Microsoft is releasing some updates to Office 365 Message Encryption (OME) in January. The detail in the announcement wasn’t great, so we plunged in to find out what’s happening. THe bottom line is that OME will use tenant domains to send email so that anti-spam filters will consider the messages to be authentic.