Answer 1

You have to setup SMTP(simple mail transfer protocol).
You can use package called nodemailer to do this easily.

Read more:
https://stackabuse.com/how-to-send-emails-with-node-js/

Answer 2

You can use nodemailer as 🔫 Rick Grimes mentioned.
Or you can register an account in sendGrid, setup email api.

https://sendgrid.com/solutions/email-api/

// Sample Node.js code
const sgMail = require('@sendgrid/mail');
sgMail.setApiKey(process.env.SENDGRID_API_KEY);
const msg = {
to: '[e-mail]',
from: '[e-mail]',
subject: 'Sending with Twilio SendGrid is Fun',
text: 'and easy to do anywhere, even with Node.js',
html: '<strong>and easy to do anywhere, even with Node.js</strong>',
};
sgMail.send(msg);