We are attempting to verify a fix.
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We are looking into the issue you are reporting to diagnose the root cause.
It is not possible to send an email to email@example.com from several mail providers. An error message appears: 550 Invalid DNS MX or A/AAAA resource record
The following mail providers are affected: gmx.de; gmx.net; web.de; 1und1.de probably other providers are affected.
The following mail providers have been successfully tested: gmail.com; xerox.com
So why is the service not available from german mail providers?