How to create relay host for nodemailer mail sent

A relay host, also known as a mail relay or mail forwarder, is a server that relays email messages from your application to the final destination, such as a mail server or a mail service provider. In the context of Nodemailer, a relay host is used to send emails through a third-party mail server, rather than directly from your application.

Here's a step-by-step guide to create a relay host for Nodemailer:

Step 1: Choose a relay host

You can use a public relay host or a private one. Some popular public relay hosts include:

Sendgrid
Mailgun
Amazon SES
Mailjet

If you have a private mail server, you can use that as well.

Step 2: Set up the relay host

Follow the setup instructions for your chosen relay host. This typically involves creating an account, setting up a domain, and generating API keys or credentials.

Step 3: Configure Nodemailer

In your Nodemailer configuration, set the transport option to use the relay host. Here's an example using Sendgrid:

const nodemailer = require('nodemailer');

const transporter = nodemailer.createTransport({
  host: 'smtp.sendgrid.net',
  port: 587,
  secure: false, // or 'STARTTLS'
  auth: {
    user: 'your_sendgrid_username',
    pass: 'your_sendgrid_password'
  }
});

Replace your_sendgrid_username and your_sendgrid_password with your actual Sendgrid credentials.

Step 4: Set the from address

In your Nodemailer configuration, set the from address to the email address you want to use as the sender. This address should be the same as the one you set up in your relay host.

transporter.options.from = '[email protected]';

Step 5: Send emails

Now you can use the transporter object to send emails. Nodemailer will relay the emails through your chosen relay host.

const mailOptions = {
  from: '[email protected]',
  to: '[email protected]',
  subject: 'Hello from Nodemailer!',
  text: 'Hello from Nodemailer!'
};

transporter.sendMail(mailOptions, (error, info) => {
  if (error) {
    console.log(error);
  } else {
    console.log('Email sent: ' + info.response);
  }
});

That's it! Your Nodemailer application should now be sending emails through the relay host.

Remember to replace the placeholders with your actual relay host credentials and email addresses.

Mail Knowledge

How to create relay host for nodemailer mail sent