SMTP -> ERROR: RCPT not accepted from server

Question

 require("phpmailer.inc.php");

class sendmail
{
public static function sendAccountActivateMail($to,$subject,&message)
{
    $flg = false;
    try
{
$mail= new PHPMailer(); 
$mail->IsSMTP(); 
$mail->SMTPAuth= true; 
$mail->SMTPSecure= "tls"; 
$mail->Host= "smtp.gmail.com"; 
$mail->Port= 587; 
$mail->Username= "[email protected]"; 
$mail->Password= "xxxxxx"; 
$mail->AddReplyTo("[email protected]"); 
$mail->From= "[email protected]"; 
$mail->FromName= "Website"; 
$mail->Subject= $subject; 
$mail->WordWrap= 50; 
$mail->Body = $message; 
$mail->AddAddress($to); 
$mail->Send(); 
}
catch(Exception $e)
    {
        $flg = false;
    }
    return $flg;
}
}

Trying to send mail through phpmailer with smtp. turning on debug gives me error:

SMTP -> ERROR: RCPT not accepted from server: 550 SMTP AUTH is required for message submission on port 587 SMTP -> ERROR: DATA command not accepted from server: SMTP -> NOTICE: EOF caught while checking if connected

Answer 1

It looks like port 587 is blocked. Try using

$mail= new PHPMailer(); 
$mail->IsSMTP(); 
$mail->SMTPAuth= true; 
$mail->SMTPSecure= "ssl"; 
$mail->Host= "smtp.gmail.com"; 
$mail->Port= 465;.....