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I want to do that, but I also want many aliases without buying many domains that are ultimately tied back to me by ICANN WHOIS. + aliases and catch-all rules are not really a solution for this because if it’s all on one domain it’s all linkable to one identity.

I’ve also considered using a service like Njalla, but they’re expensive and you need to trust they won’t run away with your domains.

Is there some way of having a backup for relatively short outages like this on a single domain? From what I understand DNS entries for mail and mail security block quickly switching providers temporarily right?

Proton's target audience are folks who care about privacy and at least a few bits of anonymity. Using your own domain will make you stand out like a sore thumb across all services you sign up to.

You’re not wrong, but many Proton customers are also just suckers who fell for the marketing without understanding any of the tech or limitations of the service. I say this as a Proton customer myself.