Questions on building an email server

I’m investigating what would be needed to build an email server on the IC. I have bunch of questions and I thought this was a good place to ask.

What would the tech stack look like?
I’ve heard I need idempotent calls, is this already possible?

How would I host a domain for emails? I believe I would need to buy it from a centralized source as there are no IC alternatives (because domains derive from TLD) right?
Basically, because TLD are centralized all domains are kinda centralized right?

How does ip configuration with domains work on the IC ( to configure the DNS) ? How do I know the IP of a node or do I even need to know?

Thanks

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