Change your password in regular intervals (we recommend every three months). This protects your mailbox from unauthorized access.
Make sure that your password is not easy to guess. Use a password with at least eight characters and ensure that it contains letters, numbers and special characters. For instance, use the starting letters of a sentence that you are familiar with: Usually, I write 10 e-mails per day. The password would then be "UIw10epd.".
Do not use your GMX password for other online services. Choose a different secure password for each online service.