This Guide to GMX login assumes you already have an active GMX email address. If you don't have a free email account with GMX already, simply go to www.gmx.com and press the Sign Up button at the top right corner of the GMX homepage. In the sign up form fill in all appropriate fields and press "I accept. Now create an email account. The sign-up process is very simple, with only a few required fields to be filled in, and most importantly, for verification (optional) it doesn't require a phone number.