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WhatsApp allows Group Conversations and Sharing Media (Pictures, Videos, Files, Audio Files, GPS Location, Video Calls). SMS and MMS can not cope with that in large quantity like 100mbs of video files and hundred of pictures, because data is cheaper than MMS costs.

This Privacy policy change whill allow Facebook, who bought WhatsApp, to extract all these data for their own purpose, before it was not the case.

InternetWorx - inwx.net

Use something like ProxMox Mail Gateway to let it take the chunk of traffic