I suspect we're approaching this situation for numerous types of communication.
If you think about it, the whole "we're going to overnight the offer letter via FedEx" thing is a well-established variant of this trick. It's less about the 48 hour service than the fact that spoofs cost $10 a pop, and would be unlikely to manifest in volume (though of course targeted attacks might occur).
Similar for regular USPS, though that hit's only $0.68 presently.
If you think about it, the whole "we're going to overnight the offer letter via FedEx" thing is a well-established variant of this trick. It's less about the 48 hour service than the fact that spoofs cost $10 a pop, and would be unlikely to manifest in volume (though of course targeted attacks might occur).
Similar for regular USPS, though that hit's only $0.68 presently.