I believe I will start recommending Proton Mail to more people.

The Easy Switch tool is pretty neat. So if you are moving from Gmail, Outlook or Yahoo it will help you set up automatic forwarding from the old address to the new address. And the import tool will let you move across all your email if you want. This means you can stop using the old address right away since any email to that address will be forwarded to your new address. And when you reply to those emails, your new proton.me address will be the sender. Ideally you’ll add a footer message alerting people of your new email address.

The next step is to upgrade and set up Proton Mail with your own domain name, for better future-proofing. But the point here is that there is really no reason to stay with a US email service if you're in Europe.

These days Proton has its own calendar service, office suite, password manager, vpn service and more. Paying a small fee every month to access all that makes a lot of sense. And having your own domain is what will allow you to switch email providers without ever changing your email address again.