Hello Marek,

Sorry for the inconvenience. Please check again now.

It looks like you were using the variable {{email}} in the email header (https://prnt.sc/i4SiX57RU6-_), but that variable wasn't available in your form. You have a field named e-mail (https://prnt.sc/MR8QOHCIlM1E). I've updated the email header to use the e-mail field instead, which should resolve the problem.

Let me know if you need further assistance. If this doesn't solve the issue, please reach out and I'll look into it more deeply.

Best regards