How do I stop spam emails on GMX?

I've been inundated with spam emails on my GMX account. Could you assist me in understanding how to effectively block and prevent these unsolicited messages? I've tried marking them as spam, but they continue to flood my inbox. Are there any additional settings or tools I can utilize to ensure a cleaner and more secure email experience? Additionally, I'm curious if there's a way to report these spammers to GMX or any relevant authorities to help mitigate the issue? Your insights and suggestions would be greatly appreciated.