As perhaps the least secure system in common use today, I've been wondering for about a decade what would replace email. I don't like it, I use it only for automated forms, and I generally think it needs to be superseded. All the efforts to extend or somehow "fix" the system end up optional and thus mostly useless, between the insecure infrastructure making spam extremely easy to send and the lack of compulsory encryption (which would have the advantage of ensuring its support by default in clients/interfaces). It seems like the only way to fix it is a fully incompatible replacement, with the unfortunate likelihood that some form of bridging would end up existing even then, opening up any new system to the problems of the old.
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