The feature was announced this spring, and I saw a couple of posts on it over the summer. But I never saw it in production. last week however, admins were notified through the O365 portal that the feature is now being rolled out, and should be completed by the end of this month (Link).
I would advice all admins to read this post on Message policy settings, and consider the options for this new features: "User controlled", "On for everyone" or "Off for everyone"
I would advice all admins to read this post on Message policy settings, and consider the options for this new features: "User controlled", "On for everyone" or "Off for everyone"