The best Mail Server alternative to Proton Mail is mailbox. It's not free, so if you're looking for a free alternative, you could try SwisMail or PEPS. If that doesn't suit you, our users have ranked more than 50 alternatives to Proton Mail and seven of them are Mail Servers so hopefully you can find a suitable replacement. Other interesting Mail Server alternatives to Proton Mail are Fastmail, Purelymail, Kolab Now and Fripost.
E-mail inbox, online office, cloud storage, and video conferencing. Business or personal plans. From 1 € /month (1.10 USD).
Almost everyone thinks mailbox is a great Proton Mail alternative.
Fastmail offers secure email hosting with comprehensive webmail services, including IMAP, POP, and SMTP protocols. It supports file sharing, shared folders, large mailboxes, instant messaging, and is compatible with popular email programs. Excellent for businesses with compliance features.
Purelymail is an email hosting app that allows users to manage their emails using their preferred email client software or through the app's webmail service, which is powered by Roundcube. The app is compatible with most mail apps, supporting IMAP and POP3 protocols.
Purelymail is the most popular SaaS alternative to Proton Mail.
Kolab Now provides a suite of intuitive apps in a user friendly environment to make your day to day online comms easier, smarter and most importantly; secure.
Fripost – the Free Email Association. Fripost organize the people who want an alternative to "free" e-mail services where you are constantly under surveillance and personal data is handed over to third parties.
Germany
EU
Australia
United States
Switzerland
Mailbox.org is a partial replacement for Protonmail. It offers a fully functional email solution (email, calendar, contacts), but with the added benefits of PGP encryption support (you can handle the keys or let them do it). It also allows you to send links to people who don't use PGP if you want to send private messages. For the encryption, it's a bit like Protonmail. For everything else, it's like a privacy-respecing Gmail alternative.