How I can add new mail configuration in K9 Android app

Support
5

K-9 Mail and Thunderbird use a mechanism called Autoconfig to fetch the server settings for a given email address. The documentation is currently sparse, but should give you an idea on how to start. See autoconfig/README.md at master · thunderbird/autoconfig · GitHub

Basically, you create an XML file and make it available under https://autoconfig.{emailDomain}/mail/config-v1.1.xml (where {emailDomain} is a placeholder for your actual email domain).

For an example, see https://autoconfig.posteo.de/mail/config-v1.1.xml

Notes:

  1. You don’t actually have to include all supported domains in <domain> tags. Thunderbird and K-9 Mail only check that at least one <domain> tag is present and contains a valid domain name.
  2. You have to make sure that the web server serves a valid TLS certificate for autoconfig.{emailDomain}. And that’s for all of the email domains you support.
  3. K-9 Mail doesn’t send the emailAddress query parameter. The reason for this can be found here: Autoconfig url emailaddress not supported

If you have further questions that you don’t want to discuss in public, please feel free to reach out to cketti@thunderbird.net.