- Open your Mac calendar.
- Click in the menu at the top left on “Calendar” and then “Settings”.
- Click the “Accounts” tab, and then at the bottom left on the plus symbol.
- Choose account type: “CalDAV”.
- Change the account type setting from “Automatic” to “Manual”.
- Enter your Posteo email address as the user name (lower case) and your Posteo password as the password.
- The server address is “posteo.de”.
- Next, click “Set” and close the settings section.
- The first synchronisation can take a few seconds, please have patience.