I'm trying to set up a site with a few contact forms on it in WordPress. ONe of the forms is quite complicated with a few drop downs, radio buttons, etc. Usually this is no problem I use Contact Form 7 and do it all in a WYSIWYG way and the form is created.

However, I'm doing this on a client server a French (Apache on Linux) host called OVH and none of them work. They never send an email to the recipient.

It's difficult getting a message through to the host as they keep on coming back saying that they've tested the server with:

PHP Code:
and it works but I don't want to go and code all these forms manually in PHP it would take me ages as I'm not great with PHP.

Does anyone know why several contact form plugins would not send mail from a particular server?

What can I say to the host to get them to help me?