How to block test mail server with node

To block a test mail server with Node.js, you can use a library like nodemailer to send an email and then use a library like mailparser to parse the email and check if it's a test email. Here's an example of how you can do this:

First, install the required libraries:

npm install nodemailer mailparser

Then, create a Node.js script that sends an email using nodemailer and checks if it's a test email using mailparser:

const nodemailer = require('nodemailer');
const MailParser = require('mailparser').MailParser;

// Create a test email server
const testEmailServer = nodemailer.createTransport({
  host: 'smtp.example.com',
  port: 587,
  secure: false, // or 'STARTTLS'
  auth: {
    user: '[email protected]',
    pass: 'testpassword'
  }
});

// Send an email to the test email server
testEmailServer.sendMail({
  from: '[email protected]',
  to: '[email protected]',
  subject: 'Test email',
  text: 'This is a test email'
}, (err, info) => {
  if (err) {
    console.error(err);
    return;
  }

  // Parse the email using mailparser
  const mailParser = new MailParser();
  mailParser.parse(info.message, (err, mail) => {
    if (err) {
      console.error(err);
      return;
    }

    // Check if the email is a test email
    if (mail.headers['x-test-email']) {
      console.log('This is a test email!');
      // Block the email
      //...
    } else {
      console.log('This is not a test email.');
    }
  });
});

In this example, we create a test email server using nodemailer and send an email to it. We then use mailparser to parse the email and check if it has a X-Test-Email header. If it does, we log a message indicating that it's a test email and block the email (you can add your own blocking logic here).

Note that this is just an example and you may need to modify it to fit your specific use case. Additionally, you should be aware that blocking emails based on headers is not foolproof and can be bypassed by malicious actors.

Also, you can use other libraries like email-validator to validate the email and check if it's a test email.

const emailValidator = require('email-validator');

//...

if (emailValidator.validate(mail.headers.from)) {
  console.log('This is a test email!');
  // Block the email
  //...
} else {
  console.log('This is not a test email.');
}

Please keep in mind that this is just an example and you should consider the security implications of blocking emails based on headers.