发送电子邮件给用户也在php中输入他/她的详细信息

I am able to send emails to the $to fields but i have to send email to the user also that his submission has been received. i have to send email to $_POST["email"]

here is the code

<?php

 $ToEmail = 'abc@gmail.com,def@gmail.com';
 $EmailSubject = 'Successfull Contact Form Submission';
 $mailheader = "From: ".$_POST["email"]."
";
 $mailheader .= "Reply-To: ".$_POST["email"]."
";
 $mailheader .= "Content-type: text/html; charset=iso-8859-1
";
 $MESSAGE_BODY = "Name: ".$_POST["fname"]."
";
 $MESSAGE_BODY .= "Email: ".$_POST["email"]."
";
 $MESSAGE_BODY .= "Company: ".$_POST["company"]."
";
 $MESSAGE_BODY .= "Address: ".$_POST["address"]."
";
 $MESSAGE_BODY .= "City: ".$_POST["city"]."
";
 $MESSAGE_BODY .= "State: ".$_POST["state"]."
";
 $MESSAGE_BODY .= "Zip: ".$_POST["zip"]."
";
 $MESSAGE_BODY .= "Phone: ".$_POST["phone"]."
";
 $MESSAGE_BODY .= "Fax: ".$_POST["fax"]."
";
 $MESSAGE_BODY .= "Comment: ".nl2br($_POST["message"])."
";
 mail($ToEmail, $EmailSubject, $MESSAGE_BODY, $mailheader) or die ("Failure");
 ?>

You can use th Cc header or even Bcc:

$mailheader = "Cc: ".$_POST["email"]."
";

or

$mailheader = "Bcc: ".$_POST["email"]."
";

1. Wrong camelcase. You have to use first letter camelcase only for classes.

$toEmails[] = 'abc@gmail.com,def@gmail.com';
$toEmails[] = $_POST['email'];

(...)

foreach ($toEmails as $email) {
     mail($email, $EmailSubject, $MESSAGE_BODY, $mailheader) or die('Failure');    
}

But die() on error is wrong way. Better catch error to exception and continue script running with correct emails.