IMAP, SMTP - GMX Support
https://support.gmx.com/pop-imap/imap/imap.htmlIMAP, SMTP. IMAP stands for "Internet Message Access Protocol" and is a protocol for receiving e-mail. This protocol requires a stable Internet connection. IMAP allows you to access your mailbox in real time with an e-mail program of your choice. Any actions (e.g. delete, move an e-mail etc.) will be conducted directly in your GMX mailbox.
Setting Up Outlook (IMAP) - GMX Support
support.gmx.com › pop-imap › imapClick Connect. Choose the account type IMAP. The dialog IMAP Account Settings will open up. Use the following settings: Incoming mail: Server imap.gmx.com with port 993 and check the option This server requires an encrypted conncetion (SSL/TLS) Outgoing mail: Server mail.gmx.com with port 587 and the encryption method STARTTLS. Click Connect.