$message = "Письмо от пользователя";
$mail = new PHPMailer(); // create a new object
$mail->CharSet = 'UTF-8';
$mail->SMTPOptions = 'ssl';
$mail->IsSMTP();
$mail->SMTPDebug = true;
$mail->SMTPAuth = true; // authentication enabled
$mail->Host = "smtp.gmail.com";
$mail->Port = 465; // or 587
$mail->IsHTML(true);
$mail->Username = "user@gmail.com";
$mail->Password = "password";
$mail->SetFrom("user@gmail.com");
$mail->Subject = "Письмо от посетителя";
$mail->Body = $message;
$mail->AddAddress('test@gmail.com');

$message = "Письмо от пользователя";
$mail = new PHPMailer(); // create a new object
$mail->CharSet = 'UTF-8';
$mail->SMTPOptions = array(
'ssl' => array(
    'verify_peer' => false,
    'verify_peer_name' => true,
    'allow_self_signed' => false
    )
);
$mail->IsSMTP();
$mail->SMTPDebug = true;
$mail->SMTPAuth = true; // authentication enabled
$mail->Host = "smtp.gmail.com";
$mail->Port = 587; // or 587
$mail->IsHTML(true);
$mail->Username = "user@gmail.com";
$mail->Password = "password";
$mail->SetFrom("user@gmail.com");
$mail->Subject = "Письмо от посетителя";
$mail->Body = $message;
$mail->AddAddress('test@gmail.com');