This guide is for subscribers of the Above Privacy Suite. (APS), however if you use another email provider you can follow this guide in the same way given you have their IMAP / SMTP information, common email providers can be found at the following link.

Common Provider Settings
K-9 Mail is an open source email client focused on making it easy to chew through large volumes of email
Google / Yahoo / AOL / Microsoft

Setup your personal email in K9 Mail using IMAP

Open K-9 Mail and enter your email address and password.

Click next & choose IMAP

Incoming Mail (IMAP) is setup first. You will need to change the IMAP server to mail.above.im. Set Security to SSL/TLS with port 993.

Outgoing Mail (SMTP). Change the SMTP server to mail.above.im. Set security to STARTTLS with port 587.

Keep Folder Sync default at every hour. Leave Messages to Display at default (25). Keep "notify me when mail arrives" checked to receive notifications.

Set an Account name for this email, this is only used within the K-9 Mail app. Your outgoing message name will display on emails you send from the App.

Full setup

If you're having issues receiving emails, you can find these by going to Settings. Click on the account you have added. IMAP settings can be found in Fetching mail and SMTP settings found in Sending mail. Scroll down and open Incoming/Outcoming server.

FAQ
K-9 Mail is an open source email client focused on making it easy to chew through large volumes of email