When you discover that the error is in login, you will have no other option than resetting your password.
Let’s reset the GMX email password:
Step 1: Go to the Gmx sign-in page, then click on the option that you cannot access to your account. This will redirect you to the GMX help center page.
Step 2: In that help center page, click on the link that says that you cannot login to your account.
Step 3: Now you will be taken to the next page where common reasons you are having these login errors can be seen.
Step 4: Scroll till the bottom and click that you want to reset the password.
Step 5: You will now be in the page where you can reset your GMX password.
Step 6: Enter the email address on the required field, then verify that you are not a bot by entering a verification code.
Step 7: Then continue the on-screen instruction and proceed as the following to reset your GMX password successfully.
This is how you can easily reset the password and get rid of Gmx Email Login issues.
also visit: https://www.redgalanga.com.au/forum/general-discussions/sign-in-to-gmx-mail-account-fix-gmx-login-issues