GMX Mail is a free advertising-supported email service provided by GMX (Global Mail eXchange, in Germany: Global Message eXchange). Users may access received GMX Mail via webmail, or using POP3 or IMAP4 protocols. Mail is sent using SMTP. Founded in 1997, GMX is a subsidiary of United Internet AG, a stock-listed company in Germany, and a sister company to 1&1 Internet and Fasthosts Internet. 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. Popup ads are displayed to all users, including premium, at login; as of 2021 GMX was the only large email provider using popup ads.

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