issue in sending mails in bulk in php - php

Question

I am design a form for sending mail in bulk via phpMailer, for example i want to send a mail to 50 persons.but the issue is after sending mail 10 to 15 persons my form gives an file not found exception.
my ajax call is given below
.on('success.form.bv', function(e) {
e.preventDefault();
$('#send_email_next').modal({
backdrop: 'static'
});
$.ajax({
type: "POST",
url: "email_next.php",
data: $("#emailform").serialize(),
success: function(html){ $("#modal_body").html(html);}
});
});
Phpmailer function called in email_next.php is given below
require_once("class.phpmailer.php");
require_once("class.smtp.php");
$mail = new PHPMailer();
$body=" ";
set_time_limit(0);
$mail->IsSMTP();
$mail->Timeout = 10000;
$mail->SMTPKeepAlive = true;
$mail->SMTPDebug = false;
$mail->do_debug = 0;
$mail->SMTPAuth = true; // enable SMTP authentication
$mail->SMTPSecure = 'tls'; // sets the prefix to the servier
$mail->Host = "smtp.gmail.com"; // sets GMAIL as the SMTP server
$mail->Port = 587; // set the SMTP port
$mail->Username = $account_user_name; // GMAIL username
$mail->Password = $password; // GMAIL password
$mail->From = $account_user_name;
$mail->FromName = 'Rayat Bahra Group';
$mail->Subject = $_POST['subject'];
$mail->AltBody = '';
$mail->WordWrap = 50;
$mail->MsgHTML($body);
$mail->MsgHTML($content);
$mail->IsHTML(true); // send as HTML
$SN = 0;
$error_mail=0;
$total_mails_to_send = count($email_array);
foreach($email_array as $recipient_address)
{
$mail2 = clone $mail;
$mail2->MsgHTML($content);
$mail2->AddAddress(trim($recipient_address));
$status = $mail2->Send();
if($status)
{
$SN++;
}
else{
$error_mail = 1;
}
echo $SN." out of ".$total_mails_to_send. " sent <br>";
}
if($error_mail == 1)
{
echo "Message was not sent <br />PHPMailer Error: " . $mail->ErrorInfo;
}
else{
echo "Message has been sent";
}
$mail->SmtpClose();