مشکل در ارسال ایمیل

[پیام حیاتی]

سلام
قسمتی برای بازگرداندن پسورد کاربر از طریق ایمیل در سایت ایجاد کردم اما ایمیل ارسال نمی شود.
این کدها:

//receive user
if (isset($_POST['sub_receive_pass']) && !empty($_POST['txtEmail'])) {
   $email = htmlentities($_POST['txtEmail']);
   $safe_email = mysqli_real_escape_string($conn, $email);
   //search pass
   $sel_user = "select * from users where u_email = '$safe_email'";
   $run_user = mysqli_query($conn, $sel_user);
   $check_user = mysqli_num_rows($run_user);
   $main_email = "";
   if ($check_user > 0) {
       mysqli_set_charset($conn, "utf8");
       $sql = "SELECT * FROM users where u_email = '$safe_email'";
       $result = mysqli_query($conn, $sql);
       while ($row = mysqli_fetch_assoc($result)) {
           $main_email = $row["u_email"];
           $pass = $row["u_pass"];
           //send email
           $headers = "MIME-Version: 1.0" . "rn";
           $headers .= "Content-type:text/html;charset=UTF-8" . "rn";
           // More headers
           $headers .= 'From: <webmaster@example.com>' . "rn";
           $headers .= 'Cc: myboss@example.com' . "rn";
           $subject = "Password key";
           $descrip = "";
           //mail("payam.hayati@yahoo","$subject","$descrip","From : $email","$headers");
           mail("$main_email", "$subject", "$descrip", "Password : $pass", "$headers");
           echo "<script>alert('Password sent to your email')</script>";
           echo "<script>window.open('forget.php', '_self')</script>";
           return;
       }
   } else {
       echo "<script>alert('This email is not registered in the system!')</script>";
       echo "<script>window.open('forget.php', '_self')</script>";
   }
}
if (isset($_POST['sub_receive_pass']) && empty($_POST['txtEmail'])) {
   echo "<script>alert('Enter your email address')</script>";
   echo "<script>window.open('forget.php', '_self')</script>";
}

تشکر

[ADMIN]

از PHP Mailer یا SwiftMailer استفاده کنید. تنظیمات SMTP سایتتون رو داخلش وارد کنید تا ایمیل به‌درستی ارسال بشه.