public override void NoOp (CancellationToken cancellationToken = default (CancellationToken))
{
CheckDisposed ();
if (!IsConnected)
throw new ServiceNotConnectedException ("The SmtpClient is not connected.");
var response = SendCommand ("NOOP", cancellationToken);
if (response.StatusCode != SmtpStatusCode.Ok)
throw new SmtpCommandException (SmtpErrorCode.UnexpectedStatusCode, response.StatusCode, response.Response);
}