/* SMTP Settings */
add_action( 'phpmailer_init', 'mail_smtp' );
function mail_smtp( $phpmailer ) {
  $phpmailer->isSMTP();
  $phpmailer->Host = 'servidor';//'smtp.mail.com'
  $phpmailer->SMTPAutoTLS = false;
  $phpmailer->SMTPAuth = true;
  $phpmailer->Port = 587;
  $phpmailer->Username = 'usuario@mail.com';
  $phpmailer->Password = 'Password';

  // Additional settings
  $phpmailer->SMTPSecure = "SMTP_PROTOCOL";
  $phpmailer->From = 'usuario@mail.com';
  $phpmailer->FromName = 'Usuario';
}