Reference:, GMX and Domains

GMX and are two freemail providers based owned by United Internet (1&1) and primarily based in Germany, but providing free email seemingly globally. might be considered the "US edition" of their email service and has nearly 200 different email domains to choose from.

It's been tough to find a published reference list of domains used by them (with the exception of the domains), but here's what I was able to come up with, with help from smart guys Jakub Olexa and Udeme Ukutt.

I've tried to narrow this list down to domains that I believe to be owned by the provider, not domains owned by customers and pointed at the ISP.

Open questions:
  • Do I have all possible domains listed here? Probably not.
  • Should I be combining and GMX domains together? They are sort of separate, but they're owned by the same company and seem to utilize the same spam filtering.
  • Have I missed anything else here? Feel free to share your thoughts in comments.
This list may be a bit incomplete, but I think it's probably a good starting point if you're looking to segment out mail to subscribers at these ISPs or if you plan to adjust MTA settings for how you send mail to subscribers there. I hope you'll find it useful!

GMX and domains:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, domains:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

That's a lot of domains. And I don't even think I've gotten all of them.


  1. Are you sure about the alternative domains? I have used their services for years and used to have a couple email addresses with those alternative "fun" domains, but I LOST then when they were discontinued years ago. I tried to check to set of they brought them back, but it didn't look like they did.

  2. Are you sure about those alternative email domain names? I used to have a couple of emails with those alternative "fun" email domains and I lost them when they discontinued them years ago. I tried to see if they brought them back, but it doesn't look like they did.

  3. I am sure that the domains exist and MX to the appropriate mail servers. Whether or not they have active users still is not something I've investigated.

  4. GMX and 100% sharing same spam filtering called Nemesis. I've seen it in bounces + postmaster tools reffers to gmx


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