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The problem there is most of the hard work the OP mentions has nothing to do with the mail server itself, but instead it's around DNS, networking, certificates, and monitoring 3rd party services.

Some of this may be able to be automated, but that's the hard part; not installing and configuring a few software packages.

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This is definitely an issue. The emails server is easy. The tedious part is the infrastructure setup.

The real problem is that the unencrypted nature of email makes most solutions non-starters. If end-to-end were the default, then you could imagine having a process whereby you ran a P2P service which kept your MX records pointed to a cluster of network members, all of whom agreed to act as your MX fallback if you went down and which collectively handled monitoring and distributing blacklist notifications.

You're implying that this is not advisable to do because any such fallback could snoop the data?

I'm sorry I'm not sure I quite understand what you say the problem is and how it relates to the unencrypted nature of email.

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