To set up a CatchAll forwarding for a domain on a existing eMail address proceed as follows:

1. Log in to the customer center
2. Select your contract
3. Select the "Alias/Addressen"
4. Click "Anlegen"
5. Under "Typ der Adresse:" select "Sammelaccount auf externe
    Adresse"
6. Under "Forward-Adresse:" enter your forwarding eMail address.
7. Save your information.

Done. Your CatchAll eMail Forwarding is now active.