terdapat email masuk kurang lebih 1500 setelah mengirim ke 24 orang menggunakan smptp php mailer

Assalamualaikum.. selamat malam...

jadi saya mengirim email menggunakan smptp phpmailer, saya tes kirim email ke 24 user, nah alhamdulillah berhasil, tapi di email yang di daftarkan smptp, terdapat email masuk sekitar 15000 an, kira kira kenapa ya?

  $process=explode(",",$email);

foreach ($process as $rowEmail) {

    $rowEmail = trim($rowEmail);
	$sql="INSERT INTO `tabel_nama_email_blast`(`id_nama_email`, `id_email_blast`, `nama_email`) VALUES ('','$id','$rowEmail')";

	$query=mysql_query($sql);
	if ($query==true) {

	        $mail = new PHPMailer;
	        $mail->IsSMTP();
	        $mail->SMTPSecure = 'ssl';
	        $mail->Host = "smtp.gmail.com"; //host masing2 provider email
	        $mail->SMTPDebug = 0;
	        $mail->Port = 465;
	        $mail->SMTPAuth = true;
	        $mail->Username = "muhammadalfit808@gmail.com"; //user email
	        $mail->Password = "****"; //password email
	        $mail->SetFrom("muhammadalfit808@gmail.com","Amaranthine"); //set email pengirim
            $mail->Subject = "$subject"; //subyek email
            $mail->AddAddress("$rowEmail","$rowEmail"); //tujuan email
            $mail->isHTML(true);
            $mail->MsgHTML("$pesan");
            $mail->Send();
        }
}