$mail = new PHPMailer;

$mail->SMTPDebug = 3;
$mail->isSMTP();                                      // Set mailer to use SMTP
$mail->Host = 'mail.mydomain.com';  // Specify main and backup SMTP servers
$mail->SMTPAuth = true;                               // Enable SMTP authentication
$mail->Username = 'contact@mydomain.com';                 // SMTP username
$mail->Password = 'pass';                           // SMTP password
$mail->SMTPSecure = 'tls';                            // Enable TLS encryption, `ssl` also accepted
$mail->Port = 465;                                    // TCP port to connect to
$mail->setFrom('contact@mydomain.com', 'my name');
$mail->addAddress('....@gmail.com', 'someone');     // Add a recipient

$mail->addReplyTo('contact@mydomain.com', 'my name');
$mail->isHTML(true);                                  // Set email format to HTML

$mail->Subject = 'subject';
$mail->Body    = 'msg body <b>bold!</b>';
$mail->AltBody = 'Corpo alternativo caso o primeiro não seja exibido';

if(!$mail->send()) {
      echo 'Message could not be sent.';
      echo 'Mailer Error: ' . $mail->ErrorInfo;
} else {
      echo 'Message has been sent';
}