Email not sending trough the Fox Contact forms

I have problems with sending email.
I made two contact forms in the Joomla website, one for only ask information and the other one as a booking form.

When i fill in the information form and i submit, the email will not send, the sender also doesn't get email , email is received.
only in the screen is the tekst - Your message has been received. We will get in touch with you as soon as possible.

The same issue for the other form.

I always use fox contact and it work, but now i got this problem, and i can't find the issue.
I don't know what is wrong.

Kindly regards,
Edgar