app.get('/contactus',function(req,res)  {
	var otp = req.query.otp;
	var email = req.query.email;
	var transporter = nodemailer.createTransport({
			host: 'smtp.gmail.com',
			port: '465',
			service: 'Gmail',
			auth: {
				user : 'your@email.com',
				pass : 'your_gmail_password'
			}
		});

	var mailOptions = {
		from: 'example@mail.com', // sender email
		to: email, //  receivers email
		subject: 'help OTP verification', // Subject line
		text: "your verification OTP is " + otp, // plaintext body
		html: '<h2>your varifaction OTP is ' + otp + '</h2>' // html body
	};
	// send mail with defined transport object
	transporter.sendMail(mailOptions, function(error, info){
	    if(error){
	        console.log(error);
	    }
	    console.log('Email sent: ');
	});
});