FairEmail is easy to set up and works with virtually all email providers, including Gmail, Outlook and Yahoo!
Note that OAuth was not approved by Google, etc for the F-Droid build. For this you'll need to use the Play store version or the GitHub release.
FairEmail might be for you if you value your privacy.
FairEmail is an email client only, so you need to bring your own email address.
FairEmail does not support non-standard protocols, like Microsoft Exchange Web Services and Microsoft ActiveSync.
Main features
* Fully featured
* 100 % open source
* Privacy oriented
* Unlimited accounts
* Unlimited email addresses
* Unified inbox (optionally accounts or folders)
* Conversation threading
* Two way synchronization
* Push notifications
* Offline storage and operations
* Common text style options (size, color, lists, etc)
* Battery friendly
* Low data usage
* Small (~30 MB)
* Material design (including dark/black theme)
* Maintained and supported
This app is deliberately minimalistic by design, so you can concentrate on reading and writing messages.
This app starts a foreground service with a low priority status bar notification to make sure you'll never miss new emails.
Privacy features
* Encryption/decryption supported (OpenPGP, S/MIME)
* Reformat messages to prevent phishing
* Confirm showing images to prevent tracking
* Confirm opening links to prevent tracking and phishing
* Attempt to recognize and disable tracking images
* Warning if messages could not be authenticated
Simple
* Quick setup
* Easy navigation
* No bells and whistles
* No distracting "eye candy"
Secure
* No data storage on third party servers
* Using open standards (IMAP, POP3, SMTP, OpenPGP, S/MIME, etc)
* Safe message view (styling, scripting and unsafe HTML removed)
* Confirm opening links, images and attachments
* No special permissions required
* No advertisements
* No analytics and no tracking (error reporting via Bugsnag is opt-in)
* No Google backup
* No Firebase Cloud Messaging
* FairEmail is an original work, not a fork or a clone
Efficient
* Fast and lightweight
* IMAP IDLE (push messages) supported
* Built with latest development tools and libraries
Pro features
All pro features are convenience or advanced features.
* Account/identity/folder colors
* Colored stars
* Notification settings (sounds) per account/folder/sender (requires Android 8 Oreo)
* Configurable notification actions
* Snooze messages
* Send messages after selected time
* Synchronization scheduling
* Reply templates
* Accept/decline calendar invitations
* Add message to calendar
* Filter rules
* Automatic message classification
* Search indexing
* S/MIME sign/encrypt
* Biometric/PIN authentication
* Message list widget
* Export settings
For more information, please see here:
https://github.com/M66B/FairEmail/blob/master/README.md 
