Is it specifically something about SMS protocol, the proprietary software used to do message routing, or perhaps an ACL on the server? I would imagine that a gateway accepting emails from anywhere that were then sent via SMS would check the from field on any incoming message against RFC5322, but then again this is clearly not the case since some gateways allow any message through, allowing for spoofing.
Can someone explain where in the entire process this is weak, and why? Also why do they not fix things like this?
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