I mean, there is no guarantee of anything, to the extent that there is uncertainty. However, if I have email to receive messages, and I don't receive messages,

I mean, there is no guarantee of anything, to the extent that there is uncertainty. However, if I have email to receive messages, and I don't receive messages, I would obviously leave. That is emails utility, a message conduit. It would be silly for a company to obscure legitimate messages and it would be baffling if anyone was stupid enough to try.