Custom hosting and domain for private e-mail?

Hi,
I was digging around for sometime to find secure and private oriented place to set-up primary e-mail.

After sometime Proton was choosen, but due to lack of available usernames, I'm thinking now about going for custom domain with hosting which currently I'm paying for at OVH.

Are there any points worth to consider other than no fancy app and calendar sync? I just want to keep emails private and prevent companies from reading then content and profile it.

What …

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