I god following answer from www.domain.com.
Unfortunately we do not support coding, web design nor web development, and assisting with a PHP script would fall into this realm. Please refer to the proper documentation to get support.
Please let us know if you have further questions or concerns.
So that was not the best help to solve the problem. I have another website hosted by domain.com. There I am using a formmail.php.
I can send this file to you, if you need it.
What can I do to proceed? Do you have experience with the sittings from domain.com or what kind of sittings information do you need.