Proton doesn't offer its own aliases, they use a third party service as well. It would basically be very similar to what you already get from Relay.

Ah. By this, you mean they don't offer aliases that are under their own domain? Seems like a good thing to me, honestly.

Have a look at Mailbox.org if you're looking for integrated services, they offer packages with more than just email. It's a long-running German service.

Thanks for the tip!

Please be wary of "encrypted" mail services, they make it fairly hard to migrate away from them later, if you need to. You need special tools to get your mail out of them, and those tools are at their whim.

My understanding is that mailbox.org is one of these services? But you still recommend them? 🙂