update
Hi
problem solved - had a senior moment as I had asked and received help before!.
Incase anyone else wants to try it:
in mail_php.php
I changed the line
$mailObj = mail($mailTo,$mailSubject,$mailContent,$mailHeader);
to
$mailObj = mail($mailTo,$mailSubject,$mailContent,$mailHeader, "-f".$mailFrom);
Can't claim to know why it works ( over to Jason and Dani)
But it does solve the problem with FASTHOSTS servers here in the UK
thanks
Ian