I have been using GMX email for several years to run a support group. Mostly it worked fine but there were problems on the way such as drafts getting garbled. Now they have blocked my account for no explained reason. All enquiries are met with a plain refusal to explain themselves. So I am left unable to manage communications to my group. I presume this can happen at any time with them so don't build anything on GMX they is serious and needed on a day to day basis. In fact just avoid them and go elsewhere which is what I have to do.