GMX Mail is a free, advertising-supported email service provided by Global Mail eXchange or Global Message eXchange in Germany.

Users may access received GMX mail via webmail, or using POP3 or IMAP4 protocols.

Every user can register up to 10 individual GMX email addresses.

Popup ads are displayed to all users, including premium, at GMX login;[2] as of 2021[update] GMX was the only large email provider using popup ads.

[3] GMX Mail provides GMX.net and GMX.com users two-factor authentication (2FA) as a security measure.