Using the Mail Collector will import email of your old mailbox into your GMX mailbox. If you notice a configuration mistake, you can correct it afterwards.
The message "Your settings have been successfully saved." will appear. In this case, the Mail Collector has been created successfully.
Additional input fields appear. In this case, more information is needed to create the Mail Collector, e.g. if you have your own email domain. Proceed to step 6.