Not working!

Actually, everythings fine.
It shows up with the changes in style i wanted.
I fill out everything (as needed).
Klick on send:
it takes minutes (real) where it shows that it’s been sending…
After that I get the message that it was sent successfully (but it’s not)

Would be really nice if you might help me somehow.

ps: link to it is:

https://www.shiatsu-kellner.at/contact

cheers,
Mario

btw: beside of not working it looks really nice – WELL DONE!

https://www.ads-software.com/extend/plugins/simplemodal-contact-form-smcf/