What’s unique about GMX and Web.de filtering?

GMX and Web.de (both owned by United Internet) apply German language focused filtering that can behave unexpectedly for English language senders. Their spam detection is trained primarily on German spam patterns, which may not align with international marketing content characteristics.

These providers maintain separate reputation systems from global providers. Your Gmail reputation does not transfer to GMX. Building trust requires consistent good sending directly to these providers over time. Authentication requirements are standard, but reputation development is provider specific.

Delivery issues at GMX/Web.de often require direct engagement with their postmaster teams, who operate primarily in German. Having German speaking resources or working with agencies experienced in these markets helps navigate support processes when problems arise.