node-email-mx-checker/dist/index.js

A Node.js library to check MX records for domains

import dns from "dns";
import { promisify } from "util";
const dnsResolveMx = promisify(dns.resolveMx);
function getMXRecordsPromise(domain, timeout = 5e3) {
  return new Promise((resolve, reject) => {
    const timeoutId = setTimeout(() => {
      reject(new Error("Timeout reached while fetching MX records"));
    }, timeout);
    dns.resolveMx(domain, (err, addresses) => {
      clearTimeout(timeoutId);
      if (err) {
        reject(err);
      } else {
        resolve(addresses);
      }
    });
  });
}
async function checkMx(domain, options = {}) {
  const { timeout = 5e3 } = options;
  try {
    const mxRecords = await getMXRecordsPromise(
      domain,
      timeout
    );
    return {
      domain,
      hasMx: mxRecords.length > 0,
      mxRecords
    };
  } catch (error) {
    return {
      domain,
      hasMx: false,
      mxRecords: [],
      error: error instanceof Error ? error.message : String(error)
    };
  }
}
export {
  checkMx,
  dnsResolveMx
};
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