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If you already find K-9 Mail application as in picture, open it and 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
Select the found 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 in K-9 Mail you already have 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 with the data specified by service provider
A warning page can appear about an independent security certificate. Accept Key if you are offered to.
Application tries login for reception...
Review Outgoing server settings with the data specified by service provider
A warning page can appear about an independent security certificate. Accept Key if you are offered to.
Application tries a login for sending...
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. See next picture.
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 improvements in latest application versions. Tap Ok.
Here you see accounts page and folders to look up incoming mail. Note that you can manage multiple electronic mail accounts with same application, and by any provider.