I've been using GMX for a few years now for personal email, and haven't really had a problem with it. I recommended it to my elderly mom, and she asked me to set up an account for her (she likes the option to have aliases). I set up the account, set up a few aliases, and installed the GMX app on her phone. Two days later, she couldn't log in. I went over to her place and tried to log in, and it gave me the error message "No such account exists". I filled out the customer service form and submitted it, and was redirected to an error page. I then set up another account for her (under a different username, since although her old account 'no longer existed', the username was still in use), and two days later - boom, gone again. I tried a third time, and... same thing. I spent a week dealing with this, and it was a complete waste of time. I'm now migrating my own account away from GMX. I refuse to deal with a service where they can just randomly close my account for no reason. This is absolutely ridiculous.