GMX / Web.de / T-Online deprecated

Contacts from the subscription sources Web.de, GMX and T-Online are retrieved via the CardDAV protocol, and unlike OAuth-based subscriptions, the data is accessed via basic authentication. When adding the subscription, the user needs to provide his credentials himself, which are are stored encrypted on the server.

The CardDAV-based subscription providers are included in the package open-xchange-subscribe which needs to be enabled in your chart's values.yaml unless already done:

core-mw:
  packages:
    status:
      open-xchange-subscribe: enabled

In order to enable/disable one or the other subscription source for users, the following properties can be set through the config cascade:

com.openexchange.subscribe.dav.gmx.de = true
com.openexchange.subscribe.dav.web.de = true
com.openexchange.subscribe.dav.tonline.de = true

Please mind that these kind of subscriptions operate on regular, database-backed groupware folders, where the items from external source get imported into as long as the subscription is active. When the subscription is deleted, the data remains available and accessible in App Suite, but can still be deleted manually if desired.