I would share with you how build simple SMTP server using nodejs
First install dependencies
npm install smtp-server nodemailer
Now start coding
const SMTPServer = require('smtp-server').SMTPServer;
const nodemailer = require('nodemailer');
// Create a Nodemailer transporter
const transporter = nodemailer.createTransport({
host: 'your_smtp_host',
port: 587,
secure: false,
auth: {
user: 'your_smtp_username',
pass: 'your_smtp_password'
}
});
// Create the SMTP server
const server = new SMTPServer({
onData(stream, session, callback) {
let data = '';
stream.on('data', (chunk) => (data += chunk));
stream.on('end', () => {
// Process the received email message
console.log('Received email:\n', data);
// Use Nodemailer to send a reply (optional)
transporter.sendMail({
from: '
sender@example.com',
to: '
recipient@example.com',
subject: 'Re: Your Email',
text: 'Thank you for your email!',
});
callback();
});
},
onAuth(auth, session, callback) {
// Check authentication credentials (optional)
if (auth.username === 'your_username' && auth.password === 'your_password') {
return callback(null, { user: 'user' });
} else {
return callback(new Error('Invalid username or password'));
}
},
});
// Start the server
server.listen(25, '0.0.0.0', () => {
console.log('SMTP server listening on port 25');
});
