Form ist not sending Emails or saving data to database

[blende64]

Dear Support

The DHVC Form is driving me crazy. It is not sending any Email nor is it saving data to databse. I have installed the Plugin Postman SMTP, and the testmail is working fine. But your Form is not working. Why?

Here the link to my form:

Energiesparkönig

Thanks for help.
blende64

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