GMX: Sign-in failed because Email is not from an allowed domain.

Hello,

Problem to solve

I can't create an account or use github account because gmx.com/gmx.fr/gmx.us is not an allowed domain.

Intended users

GMX https://www.gmx.com/ is the 1&1 mail provider. Some know it has "Caramail", an old German mail provider.

Further details

Use to log in at Gitlab.com.

Proposal

Add the domain gmx.com, gmx.fr, gmx.us.

Permissions and Security

Documentation

Testing

Create a free mail account and try to log in.

What does success look like, and how can we measure that?

Links / references