Steps to Backup GMX Mail Account on Mac
You can easily Save GMX email files using MacUncle GMX Backup Tool. The tool supports Mac OS Machines.
Start MacUncle GMX Backup on Mac OS System
Enter GMX Mail Credentials - Email Address & Password on the panel.
Select the email folder to convert and choose the respective format from PST, EML, MBOX, HTML, MHT, CSV, OLM, Thunderbird, IMAP, Gmail, G Suite, Outlook, etc.
Advanced Filter option to backup emails of specific date & Export selective folders.
Go back to Start GMX Backup and choose Destination path. Then, Click Start Backup.