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If you already find K-9 Mail application as in picture, go to Chapter Continue
Open application K-9 Mail
Install K-9 Mail
If you don't find F-Droid application, go to the other guide FOSS for Android/F-Droid.
Open F-Droid apps manager
Tap on search area
Enter k-9
Tap on K-9 Mail (only this simple caption)
Tap Install
Package download can take some time
Review new application permissions and tap Next until you see the Install button
Confirm to install this application: tap Install
Installation can take some time...
Once application is installed, tap Run
Continue
Depending if K-9 Mail already manages other mailboxes or not, you will be presented different page.
For first account you will see the welcome presentation. Tap Next.
For additional account, you will see mail folders. If you don't see the accounts page, use Back until you are in this page, and tap the simple plus sign.
Fill in the 2 text boxes with the account address and password as registered at service provider. When completed tap Next
Most of mailbox accesses work with IMAP. Choose the one your service provider specified you.
Review Incoming server settings as specified by service provider
Next page can be a warning about an independent security certificate. Accept Key if you are offered to.
Application tries a reception login...
Review Outgoing server settings as specified by service provider
Next page can be a warning about an independent security certificate. Accept Key if you are offered to.
Application tries a sending login...
Review your basic preferences about reception behaviour. Note that K-9 Mail has extense configuration options to customize everything.
This last form is for account identity
As Account name you can enter the address, and as your name enter the identity that will be shown to others for this address
Change log page reports application development. Tap Ok.
Here you see accounts page and folders to look incoming mail. Note that you can manage multiple mail accounts with same application.