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When comparing K-9 vs Tutanota Mail, the Slant community recommends K-9 for most people. In the question“What are the best e-mail clients for Android? ” K-9 is ranked 2nd while Tutanota Mail is ranked 4th. The most important reason people chose K-9 is:
K-9 is available for free and licensed under the Apache License version 2.0 with source code available [here](https://code.google.com/p/k9mail/).
Specs
Question Ranking
Pros
Pro Free an open source
K-9 is available for free and licensed under the Apache License version 2.0 with source code available here.
Pro No privacy concerns
Pro Lightweight
K-9 mail does not use too many system resources when using the app, which allow it to be fast and lightweight.
Pro Complete PGP encryption
It's possible to complete encrypt email communications via PGP using K-9.
Pro imap
Works well with locally maintained IMAP server.
Pro Optimized for phone and tablet
On a tablet the UI looks a little different but given the extra real estate is logical.
Options to enable UI widgets a plus, can be enabled on a tablet and disabled on a phone.
Pro Material UI version
There is a fork of K-9 available on Google Play that uses Material design, improves the interface a lot.
Pro Excellent email threading
Threaded email support is better than most.
Pro End to end encryption
End-to-end encrypted:
- internal emails (between Tutanota users)
- external emails: requires setting a password and sharing it separately to the recipient
- calendar
- contacts
- email storage
- email subject lines
Pro Open source
See here.
Pro Based in Germany
Tutanota's servers are located in Germany, which has strict privacy protection laws, even stronger than those of Switzerland.
Pro Anonymous: no personal information and no phone numbers are required to register
Pro F-Droid app
Pro No offices in the USA
Pro Free
A free account is available.
Pro Add free
Pro Desktop client
Pro U2F for second factor authentication
Pro Affordable price for paid plans
Cons
Con Dead app
Con Emails received as forwarded EML attachments are not natively supported
When you receive an email which was forwarded as an EML attachment, K-9 Mail is not able to open it natively. It opens it using a third-party application registered for this mime-type on the device, if any. The Gmail email client app is able to read the EML attachments, thus you need to have it installed as well (or any other EML capable app).
Con Noisy UI
The user interface is bland and tries to cram a lot of information on screen, making it unpleasant to use.
Con No support for third-party clients (eg Thunderbird...)
Con Doesn't support PGP encryption
Con No support for IMAP and SMTP
You can't use your favorite email client.
