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You can use it for free, but even the paid plan starts incredibly cheap and allows you to add and remove features in a modular fashion. It's also the only encrypted mail provider offering an open source Android client at this time! Not only that, but it's available from F-Droid! I highly recommend Tutanota over competitors like ProtonMail and GMail if you care about software freedom and privacy. See More
Basic accounts are restricted to the Protonmail web client. Support for IMAP and SMTP is available with a paid subscription only, and as such with basic accounts it is not possible to send and receive email with external applications. If you have a paid account, you have to use the Bridge, which you might not be able to do. See More