What’s unique about GMX and Web.de filtering?
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If you're sending to a German audience, you've probably noticed that GMX and its sibling provider Web.de can be harder to crack than the usual suspects. There's a good reason for that.
Both GMX and Web.de are owned by United Internet, a German company, and their spam filters were built with German-language content in mind. That means they were trained mostly on German spam patterns. English-language marketing content can look unfamiliar to these filters, and not in a good way. Phrases, formatting styles, and even subject line structures that work fine for Gmail subscribers might score higher for suspicion at GMX and Web.de.
The other thing that catches senders off guard is reputation isolation. Your sending reputation at Gmail doesn't follow you to GMX. These providers run their own separate reputation systems, and you start from scratch. Building trust with them takes time and consistent behavior: good authentication, low complaints, and regular sending to engaged subscribers at those domains.
Authentication itself (SPF, DKIM, and DMARC) is expected and non-negotiable. But passing authentication alone won't get you to the inbox. Reputation is the bigger lever here, and it has to be built specifically for these providers.
When something does go wrong, the path to resolution is a little different. GMX and Web.de have their own postmaster teams, and those teams operate primarily in German. If you're running into persistent delivery issues, reaching out directly is your best option, but it helps to have German-language support available, or to work with someone who does.
A few things worth doing if you send to these domains regularly: monitor your European MBP performance separately from your global metrics, keep a close eye on complaint rates specifically from GMX and Web.de addresses, and don't assume a clean Gmail reputation means you're in good shape everywhere.
If deliverability to German providers is a real concern for your business and you're not sure where to start, our SOS hotline is free and we've been through this one before.
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