Массовая рассылка сообщений по нажатию кнопки

<?php
    include "class.smtp.php";
    include "class.phpmailer.php";
    
    $Host = "mail.yourdomain.com";                      
    $Username = "your-smtp-username@yourdomain.com";    
    $Password = "your-smtp-password";                   
    
    $From = "from-email@yourdomain.com";
    $FromName = "From Name";
    
    $Tos = array(
        "To Name 1" => "to-email-1@4rapiddev.com",
        "To Name 2" => "to-email-2@gmail.com"
    );  
    
    
    $Subject = "Hello there";
    $Body = "This is a test email which will send to multiple recipients";
 
    $mail = new PHPMailer();
 
    $mail->IsSMTP();                    // send via SMTP
    $mail->Host     = $Host; 
    $mail->SMTPAuth = true;             // turn on SMTP authentication
    $mail->Username = $Username;  
    $mail->Password = $Password; 
    
    $mail->From     = $From;
    $mail->FromName = $FromName;
    foreach($Tos as $key => $val){
        $mail->AddAddress($val , $key); 
    }
    
 
    $mail->WordWrap = 50;               
    $mail->Priority = 1; 
    $mail->IsHTML(true);  
    $mail->Subject  =  $Subject;
    $mail->Body     =  $Body;
    if(!$mail->Send())
    {
        echo "Mailer Error: " . $mail->ErrorInfo;
    }
    else
    {
        echo 'Message has been sent.';
    }
?>