It's nearly impossible to find anything tangible about exactly what they offer... They contradict themselves sometimes, claiming extensive experience and then saying their organisation is still taking shape. It looks like it's a Swedish extention of a Norweigan company (CDG Sandberg AS), who have a more solid presentation on their page. They (the Norweigans) do all sorts of direct mail advertising and "customer clubs" stuff for clients, so I imagine the Swedes do the same, and email newsletters may very well be included in that.
May I ask why you want to know?
