Where is GMX email located?

Excuse me, as a cryptocurrency enthusiast and someone who dabbles in the financial sector, I'm wondering about the location of GMX's email services. Could you kindly elaborate on where the email service for GMX is hosted? Is it a centralized server located in a specific country or a decentralized network spread across multiple locations? Also, is there any information available on the security measures employed by GMX to protect user emails from potential breaches or hacks? I'm interested in understanding the infrastructure and security behind this crucial aspect of their services.