Fastmail

DAVx⁵ has been successfully tested with Fastmail.

FastMail is an email service offering paid email accounts. It also allows to manage calendars and contacts and provides CalDAV/CardDAV interfaces.

App password

In order to use 3rd-party applications like DAVx⁵ or Thunderbird with FastMail, you need to generate an app password. Choose "Mail, calendars and contacts" access.

DAVx⁵ settings

Choose "Login with email address" and enter your FastMail email address and the generated app password (see above).

Hint: When using fastmail with your own domain without SRV records you can try to use the Login with Base URL method and use https://carddav.fastmail.com as Base URL together with your Email address and app specific password.

Contact group method: groups are separate VCards

WebDAV setup

You can mount your fastmail files using the DAVx⁵ WebDAV mounts feature.

WebDAV URL:  https://webdav.fastmail.com

User name: your fastmail email address or username
Password: your password