In order to work around the current issue of false URL in subscription mailings, we have disbaled the subscription feature for regular users
Disabling subscriptions
Go to “Permissions”/Berechtigungen:
https://supportcommunity.sso.bluewin.ch/scs/admin/permissions
Choose “Edit defaults”:

Goto “Benutzer die Verwendung von Abonnements erlauben” and set it to “Deny”:

Enabling subscriptions
Go to the same place in the admin panel
Set the option “Benutzer die Verwendung von Abonnements erlauben” to “Grant”