Proton
Empowering you to choose a better internet where privacy is the default. Protect yourself online with Proton Mail, Proton VPN, Proton Calendar, Proton Drive. Proton Pass and SimpleLogin.
Proton Mail is the world's largest secure email provider. Swiss, end-to-end encrypted, private, and free.
Proton VPN is the world’s only open-source, publicly audited, unlimited and free VPN. Swiss-based, no-ads, and no-logs.
Proton Calendar is the world's first end-to-end encrypted calendar that allows you to keep your life private.
Proton Drive is a free end-to-end encrypted cloud storage that allows you to securely backup and share your files. It's open source, publicly audited, and Swiss-based.
Proton Pass Proton Pass is a free and open-source password manager which brings a higher level of security with rigorous end-to-end encryption of all data (including usernames, URLs, notes, and more) and email alias support.
SimpleLogin lets you send and receive emails anonymously via easily-generated unique email aliases.
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I see a few people who don't want to switch due to the hassle it would take with changing email addresses, presumably because they use one of the @proton.me email domains. Get your own email domain! It's super cheap (if you choose one of the new TLDs, it can be as low as few dollars a year), the setup isn't really hard - you just change a few DNS values, and that's basically it - you can use whatever email you want that ends with your domain. It might take a while to slowly replace all your @proton.me emails with your domain one, but if you're not in a hurry and change any old mail you see during your day-to-day activities, you'll eventually be done with it, and you can set up mail forwarding to your domain for mail that arrives to your old @proton.me address.
And if you ever need to move to a different provider, you just change the DNS records again to a new provider, and your email will start coming to the new one immediately.