I would very much like to grant each registered and accpeted user to write e-mails to all other users. How can I do that? How can I set up a mass mail functionality? Do you know a way, how I could proceed?
Both Mambo and Joomla have the mass mail capability but I think you missed the point. The mass mail is in the back end and he wants all registered users to be able to mass mail which is not viable unless you want to make them all admins and give them access to the backend.