GMX Mail is a free advertising-supported email service provided by GMX (Global Mail eXchange, in Germany: Global Message eXchange). Users may access GMX Mail via webmail as well as via POP3 and IMAP4 protocols.
In addition to an email address, each GMX account includes a Mail Collector, Address Book, Organizer, and File Storage. Every user can register up to 10 individual GMX email addresses. Premium or not, users are greeted by pop-up ads at login. GMX is currently the only big email provider to support popup ads. Currently, GMX Mail has more than 11 million active users.