[8notime]

If you don't want to do the advanced config route, just modify the following keys:

HKLM\Software\Microsoft\Inbox\Settings SMSNoSentMsg = 0
HKCU\ControlPanel\Notifications\Default Options = 0
HKCU\Software\Microsoft\Inbox\Settings DisableSMSDeliveryReceipt = 0

I'm not getting the pop up box but I too am getting the "new message" indicator instead, that disappears. It would be nice to figure out how to make that not show up also.

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Update!! Please see post #192 & #196 for the most recent fix.