Ok, I finally got it. The problem is GMX has two codes 1: @gmx.us 2: @gmx.com When I filled in send email from I didn't use full name just may name and no @. Then I tried with @gmx.com and finally @gmx.us. It might have been the @gmx.us but I also changes the Username to my full email with @gmx.us and everything worked. I couldn't tell with the error message what wasn't validating but evidently it was the Username not being full email address with @gmx.us . This time I wrote it all down for the next install and maybe i won't have the same problem. Hope it helps someone else also.
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