Notice Could not instantiate mail function

Please help me! I use Chronoforms6 and I've validated it. When I test the form with my email everything is OK, but when I put the email my client it stop being received or this error appears - Notice Could not instantiate mail function. Where is problem?
The form is at the bottom of the page:
http://eu2007.com/index.php/form

Hi drumevika ,

What settings do you have in the Email action?

The From Email should match the site domain - that may be the problem.

Bob

Maybe really there is the problem because the domain is http://eu2007.com and the email is agency.europe2007@yahoo.com. But when I used Chronoforms 5, the form used the same email without problem. I need to be sure and after to say my client to change the email. The situation is a little delicate, you know?

Hi drumevika,

Why do you need that as a From Email?

Please check the Test Email button in the Site Admin email settings and see if that gives the same error.

Bob

I sent Test Email and it didn't arrive in the mailbox