Can anyone see what is wrong with this:
$EmailBody = '
--==Multipart_Boundary_xc75j85x
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Test plain email.
--==Multipart_Boundary_xc75j85x
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
<html>
<body>
Test <b>HTML</b> email
</body>
</html>
--==Multipart_Boundary_xc75j85x--';
$message = $EmailBody;
$subject = "SUBJECT";
$toname = $_POST['fullname'];
mail($POST['email'], $subject, $message,
"To: ".$toname." <".$POST['email'].">\n" .
"From: SENDER <sender@sender.com.au>\n" .
"MIME-Version: 1.0\n" .
"Content-Type: multipart/alternative; boundary='==Multipart_Boundary_xc75j85x'");
--
When I send it I receive a blank message