The smart mailbox idea was attempted by a well-funded company called Outbox. They shut down last week, for insufficient demand (cost of user acquisition too hi

The smart mailbox idea was attempted by a well-funded company called Outbox. They shut down last week, for insufficient demand (cost of user acquisition too high) http://techcrunch.com/2014/01/21/outbox-shuts-down/ http://techcrunch.com/2014/01/21/outbox-shuts-down/