If you use the GMX Mail app and/or GMX
MailCheck or access your mail via POP3/IMAP, you need to log in again once. In addition,
the use of POP3/IMAP requires (re)activating access in the email settings. For more
information, please see Activate or deactivate POP3 and IMAP.
You will need the latest version of the GMX Mail app for
two-factor authentication. For more information, please visit GMX Mail App Versions.