Verified Answer - gmx.com / gmx.net / gmx.de / web.de

Is GMX a Catch-All Domain?

No - GMX is not a catch-all domain.

GMX (gmx.com, gmx.net, gmx.de) and its sister brand Web.de both run on United Internet's shared infrastructure and reject SMTP connections to non-existent addresses. Both are individually verifiable. BounceZero handles all GMX and Web.de domains through its dedicated German ISP verification path.

Verify GMX Addresses Free

Backed by & listed on

Listed

AWS

Activate

Google

for Startups

NVIDIA

Inception

MongoDB

Atlas

Datadog

Startup Program

UK Ltd Co.

No. 17153835

Listed

AWS

Activate

Google

for Startups

NVIDIA

Inception

MongoDB

Atlas

Datadog

Startup Program

UK Ltd Co.

No. 17153835

GMX, Web.de, Freenet - United Internet Infrastructure

GMX and Web.de are the two largest German freemail providers and share United Internet's MX infrastructure. All domains across both brands are verifiable individually - none are catch-all by default.

gmx.com

gmx.net

gmx.de

gmx.at

gmx.ch

web.de

Why GMX Lists Have High Bounce Rates

GMX and Web.de accounts accumulate in German email lists because they were extremely popular in the 2000s and early 2010s. Many users have since migrated to Gmail or T-Online. Old GMX accounts get deactivated after prolonged inactivity - causing hard bounces on lists that haven't been verified recently. BounceZero's live SMTP check catches these deactivated accounts before they affect your sender score.

Frequently Asked Questions