My account is hosted at WEB.DE, which is the same provider as GMX !
WEB.DE and GMX.NET belong together with many other trade marks to United Internet, one of the biggest providers in Europe.
I just called the technical support of WEB.DE.
They told me that there is no other general spamfilter in the email path.
If they reject an email for any reason, their server always sends an answer back to the sender, indicating the reason.
He also said, that many senders do not evaluate all kinds of answers, especially in special cases.The strange thing is also, that I do receive all confirmation eMails when filing a delay via the web interface!
This lets me think, the problem is not on my side...
So I'm asking you could you please check the low level answer that you receive from the server of my email provider.
If it helps, I will file a new flightplan and delay it later and finally delete it. Just tell me, when you are ready and lie on lookout for the answer from my providers server.
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