contact us doesn't send Thank You email we configured

Hi Team,

on our website www.joyservice.in created using wix.com , there is a standard contact us form at the bottom of the page.

We had configured an “Thank Your site visitor for contacting you” automated response email. Initially it worked. But now it’s not working. Not sure, why ?

Can someone please check and let us know what could be the problem.

Thanks,
Rajan Shah.