you are using the mail function incorrectly...
mail ( string to, string subject, string message [, string additional_headers [, string additional_parameters]])
you are doing
mail( "michael@hotmail.com", "Feedback Form Results",
$details, $message, "From Mr: $surname" );
your 'to' is fine... "micheal@hotmail.com"
'subject' is fine... "Feedback Form Results"
theoretically, 'message' is fine, too... $details
additinal_headers is completely wrong... $message
and additional_parameters is wrong as well.. "From Mr: $surname"
you want this:
mail("michael@hotmail.com", "Feedback Form Results",
$details.'\r\n'.$message, "From: Mr $surname <{$email}>" );