I couldn't create an account in GMX, so I googled about it. A lot of people, including one guy from Germany who used a VPN to make it work, said they had the same problem.
Thanks for the link, it indeed gives a clue, still I believe my comment is more helpful, as I'm used to use port 465 and I had to use 587 to make it work. The SMTP address also changed, it used to be `smtp.googlemail.com`.
I would also like to add the send limits:
GMX: 50MB
Yahoo: 20MB
Goolgle: 25MB
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