Contact form didn’t works on my website

I’ve also been trying to make it work with no luck, I get the red error, yet, my provider says everything should work, I’ve acces to my CPanel, yet Im not quite sure what should I look for, also I’ve a few domains hosted on the same server and the contact form works on the rest of the domains except for one. The “from” field, has an e-mail that belongs to the website, so, im kind of lost.

Thanks in advance.