使用 SMTP 更改 PHP 电子邮件中的 FROM

我有以下代码可以正确发送电子邮件，但收到的电子邮件的 FROM 值为 root@mysite.com . 我希望收到的电子邮件的值是价值电子邮件（在联系表格中输入），以便可以轻松回复收到的电子邮件。 任何协助将不胜感激。感谢

<?php
if ($_POST["email"]<>'') 
{
 require_once "Mail.php";
 $from = "root@mysite.com";
 $to = "info <info@mysite.com>";
 $subject = "Contact us info from Website";
 $body = "Name: ".$_POST["name"]."'r'n";
 $body .= "Email: ".$_POST["email"]."'r'n";
 $body .= "Phone: ".$_POST["phone"]."'r'n";
 $body .= "Comment: ".nl2br($_POST["comment"]).""; 
 $host = "mail.mysite.com";
 $username = "root@mysite.com";
 $password = "abcdefghijk";
 $headers = array ('From' => $from,'To' => $to, 'Subject' => $subject);
 $smtp = Mail::factory('smtp', array ('host' => $host, 'auth' => true, 'username' => $username, 'password' => $password));
 $mail = $smtp->send($to, $headers, $body, "FROM: $email","-f$replyToEmail");

 mail("$toEmail", $subject, $message, "FROM: $fromEmail","-f$replyToEmail");

 if (PEAR::isError($mail)) {
   echo("<p>" . $mail->getMessage() . "</p>");
  } else {
   echo("<p>Message successfully sent!</p>");
   }
?>