Add account to mail app?

I would like to add a gmx account to my regular email app (Huawei mobile phone) but only get a notification when I register that the POP3 / SMTP service is deactivated. How can I solve this problem?

By turning it on 🤷🏼♂️

That's obvious. But still I wonder under what point in the settings

No idea you have to look at your email account maybe there's no longer there.