Does anyone have experience with hostiso.com? There the sending of the form does not work. Hostiso thinks that there is a syntax error (see screenshot line 7). For example I have included the form on this page (at the bottom of the page) https://outperform.academy/seminar-mitarbeitergespraeche/
What surprises me: I have tested the site also on hosteurope.de and everything works there without any problems. I also downloaded and tested this script (Sending Nice HTML Email with PHP | CSS-Tricks - CSS-Tricks) with exactly the same result: It does not work on hostiso and on hosteurope it works without problems.
comparing that to one I just created it looks light of some detail: name_10975 = _POST[‘name_10975’]; email_10975 = _POST[‘email_10975’]; message_10975 = _POST[‘message_10975’]; optin_10975 = _POST[‘optin_10975’];
Have you tried removing and re-adding the form?
Thanks @MartinC I just created a new project with only one form. It works and looks like yours. Apparently something went wrong with the other project. I think that I have to replace all forms again. Thanks for your quick answer