Open source email client android

5 Best Open Source Android Email Clients

I used to live in the Google PlayStore and apparently not many things have changed in the area of email client applications; most of them are closed-source and the best are among the paid titles.

I took it upon myself to check for the top open-source email client apps for Android devices and here is my list in no particular order.

1. K-9 Mail

K-9 Mail is a lightweight community-developed app that has been around for such a long time it supports most IMAP, POP3, and Exchange 2003/2007 accounts. It includes all the features you want in any email client including multi-folder sync, BCC-self, flagging, IMAP push email, signatures, filing, and privacy.

All of its features are not self-explanatory so be sure to make use of its documentation to forge ahead.

2. InboxPager

InboxPager is a Java application that supports pop, smtp, and imap protocols via SSL/TLS. It features a simple (however, dull) UI with the smooth animation transitions, auto-conversion of texts from UTF-8, OpenPGP messages support, etc.

It is not available in the Google PlayStore so you will have to download it either directly from GitHub or F-droid app store.

InboxPager Email Client

3. FairEmail

FairEmail provides you with a distraction-free Material design UI for composing and replying emails, a unified inbox, folder management, message threading, multiple accounts, etc. Its pro features include a dark theme, account colours, and signatures, among other user options.

FairEmail is security conscious and woks with only encrypted connections. It uses safe message view to prevent analytics and tracking.

The Android app is still in beta stage but you can apply to be a better tester by accepting the invitation in the PlayStore link.

p≡p stands for Pretty Easy Privacy and this email client encrypts all communications in your email without the need for you to create new accounts.

It ensures that no one can intercept your messages by using authenticating your communication partner’s messages and it uses peer-to-peer instead of a central server.

p≡p Email Encryption Client

5. ProtonMail

ProtonMail is among the world’s largest encrypted mail service provides with 2 million + users. It was founded by CERN scientists in 2013 and was even able to create the mobile app thanks to a record-breaking $550,000 donation campaign.

ProtonMail features a beautiful UI, end-to-end encryption, swiss privacy and neutrality, etc. If you want an open-source email client that is completely secure then ProtonMail is your best bet.

ProtonMail is my favorite pick on this list and maybe that is why I kept it for last. What is yours?

Have you got other open-source Android email clients we should know about? Drop your suggestions and comments in the section below.

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Best 8 Open-source Email clients for Android

An email client app is responsible for accessing your email messages on the server from your device.

Mail clients are available for desktop, or can even come in a self-hosted web-based form, which the user can install and use on their own servers local or remote.

We have covered self-hosted email client apps and open-source email servers in previous articles.

Why do you need email clients for your Android?

Although Android comes with the mail client application, some may need to use other alternatives.

In this article, we provide you, free ads-free open-source mail clients, for your android device, tablet, phone, or otherwise.

Open-source, secure, privacy-first email clients

1- K-9 Mail

K-9 Mail is a free, open-source email client app for Android. It is available in all popular Android stores like Google’s Play Store, F-Droid, and Amazon App Store.

K-9 App Features include push IMAP support, GPG/ PGP/ MIME support, multi-account setup, unified inbox, per-account notifications, email signatures, and more.

The app is an ad-free application and does not have hidden or paid features that force the user to buy.

It is licensed under Apache License Version 2.0.

2- FairEmail

Our second pick here is FairEmail, it is a lightweight feature-rich app with dozens of cool features.

FairEmail comes with a Material based interface, unlimited accounts and email addresses support, unified inbox, and threading view to track the active conversation.

FairEmail supports Gmail, Outlook, Yahoo, Yandex, iCloud email, and more.

The primary reason why we do like and use FairEmail is it is a privacy-focused application that ensures secure and private usage.

FairEmail privacy features include built-in encryption with OpenPGP, message reformatting to prevent phishing, confirming images and links to prevent tracking, and warning users if the message could not be authenticated.

We highly recommend FairEmail for your daily use.

3- InboxPager

InboxPager is a custom, lightweight, open-source email client for Android. It works with all popular email services like Gmail, Microsoft, Yahoo, Yandex, and mail.com.

InboxPage features

1. Full IMAP, POP, and SMTP via SSL/TLS, with AES/PGP support.
2. Smooth animation
3. Attachment download
4. Keep track of unread message
5. Supports OpenPGP messages
6. Display server certificates used in the last connection.
7. Automatically convert texts from their declared character encoding to UTF-8

InboxPager is available to download from the F-Droid store.

InboxPage is licensed under GPLv3.0.

4- Criptext Android Client

Criptext Android Client is a privacy-first email client for Criptext email service that supports end-to-end encryption through a Signal Protocol library.

The app does not collect or share any data usage, and it is easy to use. It also does not have any advertisement or in-app purchases.

Criptext Android Client is licensed under GPLv2. You can download it from Google’s Play Store through this link.

5- TypeApp

TypeApp is a multi-platform email agent/ client for Android, and iOS devices.

It is built to help you avoid email clutter by applying automatic clusters, which makes it an ideal email client if you have a dozen of email accounts.

1. Unified inbox
2. Smart push notification
3. Universal access through IMAP, Microsoft Exchange, or POP3
4. Email reminder and custom tasks
5. Message filters
6. Supports android wear (Android smartwatches)
7. Built-in dark theme support

TypeApp can be downloaded for Android from Play Store, and Amazon App store.

6- OpenMail

OpenMail is a full-featured, open-source email client for android, which is a fork with K9-Mail but with more features and customizations.

It is licensed as K9-Mail under Apache License Version 2.0.

p≡p email client is a multi-platform, decentralized, zero-trust email application. It is the only email client on this list with such technology.

p≡p is available for Android users from Google Play, F-Droid stores.

If you have an iOS device, you can download it for your device as well.

8- SimpleEmail

SimpleEmail is an open-source, native email client for Android. It offers simple easy email navigation, multiple accounts and identities support, two-way synchronization, offline-storage support, and more.

SimpleEmail also comes with a unified inbox, message search on server, settings export, same message view with complete JS/ styling and unsafe HTML disable, and it comes without advertisements, analytics, and tracking scripts.

You should have the F-Droid store on your phone to be able to download SimpleEmail.

Final note

The email client app is a necessary program for all sorts of users. But finding the right privacy-focused, and open-source alternatives is not an easy task.

We hope that our list will become useful for users who value their privacy and want open0-source alternative options for enterprise monopoly apps.

If you know of any other open-source, free email clients for Android that we did not list here, let us know in the comments below.

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4 open source Android email clients

Email is not on its deathbed, but most of it happens on mobile devices now.

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Even though members of the younger generations are trying to bury email as «communication for old people,» the reality is email isn’t anywhere near its deathbed. While collaboration tools, social media, and texting are important, they aren’t ready to replace email as an essential business (and social) communications tool.

Given that email isn’t going away and most of it is now read on mobile devices (according to a host of studies), having a good mobile email client is critical. If you’re an Android user who wants an open source email client, things get a little bit tricky.

K-9 Mail

K-9 Mail has been around almost as long as Android has—it originated out of a patch to the Android 1.0 email client. It has support for IMAP and WebDAV, multiple identities, attachments, emojis, and other typical email client features. Its user documentation offers help on installation, setup, security, reading and sending email, and much more.

K-9 is open sourced under the Apache 2.0 License with source code available on GitHub. It’s available for download on Google Play, Amazon, and F-Droid.

As its full name, «Pretty Easy Privacy» suggests, p≡p is focused on privacy and secure communications. It provides automatic, end-to-end encryption of emails and attachments (provided your recipient also has an encryption solution installed—if not, p≡p warns that your email will be sent without encryption).

You can access the source code (licensed under GPLv3) from GitLab and find documentation on the app’s website. Download p≡p for free on Fossdroid or for a nominal fee on Google Play.

InboxPager

InboxPager allows you to send and read email messages over the SSL/TLS protocol, which means you may need to do some tweaking if your email provider (e.g., Gmail) doesn’t turn that on by default. (Fortunately, InboxPager offers Gmail instructions.) It also supports OpenPGP encryption through the OpenKeychain application.

InboxPager is licensed under GPLv3 with source code available on GitHub, and it can be installed via F-Droid.

FairEmail

FairEmail takes a minimalistic approach to mobile email, focusing on reading and writing messages—without all the bells and whistles that risk slowing your email client. It supports multiple accounts and identities, message threading, encryption, and more.

It’s licensed under GPLv3 with source code available on GitHub. You can download FairEmail on Fossdroid; a Google Play version is available for people interested in testing the software.

There’s certainly room for other entries into the open source Android email client space (or for improving the ones above)—motivated developers, take notice. And, if you know of an application we missed, please share it in the comments.

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Open source email client android

K-9 Mail

K-9 Mail is an open source email client that works with basically every email provider.

* supports multiple accounts
* Unified Inbox
* privacy-friendly (no tracking whatsoever, only connects to your email provider)
* automatic background synchronization or push notifications
* local and server-side search
* OpenPGP email encryption (PGP/MIME)

Install the app OpenKeychain: Easy PGP to encrypt/decrypt your emails using OpenPGP.

If you’re having trouble with K-9 Mail, ask for help in our support forum.

K-9 Mail is a community developed project. If you’re interested in helping to improve the app, please join us!
You can find our bug tracker, source code, and wiki at https://github.com/k9mail/k-9.
We’re always happy to welcome new developers, designers, documenters, translators, bug triagers and friends.

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Packages

Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it’s a less secure way to download. We recommend that you install the F-Droid client and use that.

This version requires Android 5.0 or newer.

It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

This version requires Android 5.0 or newer.

It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

This version requires Android 5.0 or newer.

It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

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