Thanks for taking the time to try and help me.
Yes, as it happens, they do.
However, this issue came to light when I was setting up another contact form for a different site. This is what I was setting up and couldn't get it to work:
# SEND EMAIL
$to = 'email@example.com';
$subject = "Web site Enquiry";
$headers = "From: $email ($name)\r\n";
$headers .= "Bcc: firstname.lastname@example.org\r\n";
$headers .="Reply-To: $name <$email>\r\n";
$headers .="X-Mailer: PHP/ . phpversion()";
do NOT share the same mailbox.
When I couldn't get this to work, I went to a script that I knew was working to try and identify the problem.
I tested again with an email address that I control and doesn't go to the same mailbox.
You were RIGHT...
I then went back to the original problem (the code above) and it was working !!!
The only thing that I did was to turn off my computer (not server) last night and switch it on agan this morning.
Thanks very much for your help...