DAVx⁵ has been successfully tested with is a German email provider and focused on privacy. address books, calendars and tasks can be synchronized with DAVx⁵.

DAVx⁵ settings

Choose "Login with email address" and enter your email address and password.

If you use your own domain with you have to use the "Login with Base URL" option. Enter your email address as user name and your password.

Contact group method: There is no server-side CardDAV contact group support. Choose "per-contact categories" as contact group method to minimize problems.

Last updated: 30 Dec 2018