use dns.resolvemx in javascript

To use dns.resolvemx() in JavaScript, you need to be working with Node.js, which provides a dns module for working with DNS resolution.

Here's an example of how to use dns.resolvemx() to resolve the MX records for a given domain:

index.tsx
const dns = require('dns');

const domain = 'example.com';

// Resolve MX records for domain
dns.resolveMx(domain, (err, addresses) => {
  if (err) throw err;

  console.log(`MX records for ${domain}:`);
  addresses.forEach((addr) => {
    console.log(`Host: ${addr.exchange}, Priority: ${addr.priority}`);
  });
});
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This code will print out the MX records for the example.com domain, along with the priority of each record.

Note that dns.resolvemx() is an asynchronous function, so it takes a callback function as its second argument. This callback will be called with either an error (if there was a problem resolving the MX records) or an array of exchange and priority objects representing the MX records for the given domain.