We have prepared configuration files for you with which the setup occurs automatically. Simply open the following link in the web browser of your iPhone or iPad.
If necessary, you can also have all your settings (email, contacts and calendar) setup automatically. More info here.
All you have to do is enter your complete Posteo address as the username and your Posteo password as the password.
So that your contacts also end up in your Posteo address book from now on, you need to make Posteo your standard account for contacts. This can be done in “Settings” > “Mail, Contacts Calendar” by selecting the “Standard Account” in the “Contacts” section.
Of course, a manual setup is also possible. Please go into the “Settings” of your iPhone or iPad. Tap on “Mail, Contacts, Calendar” and then “Add Account”. Then choose “Other” and “Add CardDAV Account”. For each field, please enter the following:
Username: Your Posteo address
Password: Your Posteo password
After you tap “Continue”, your Posteo address book is set up on your iPhone or iPad and available in the Contacts application.