improve get best dns

Author: mfbx9da4

README.md

@@ -2,7 +2,7 @@
 
 Validates emails based on regex, common typos, disposable email blacklists, DNS records and SMTP server response.
 
-- Validates email is compliant with [RFC standard](https://tools.ietf.org/html/rfc2822#appendix-A.1.2) using regex.
+- Validates email is compliant with basic email format using regex.
 - Validates common typos e.g. [email protected].
 - Validates email was not generated by disposable email service.
 - Validates MX records are present on DNS.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "deep-email-validator",
-  "version": "0.1.15",
+  "version": "0.1.16",
   "files": [
     "dist/**/*"
   ],

src/dns/dns.ts

@@ -13,5 +13,13 @@ export const getBestMx = async (
   domain: string
 ): Promise<dns.MxRecord | undefined> => {
   const addresses = await getMx(domain)
-  return addresses[0]
+  let bestIndex = 0
+
+  for (let i = 0; i < addresses.length; i++) {
+    if (addresses[i].priority < addresses[bestIndex].priority) {
+      bestIndex = i
+    }
+  }
+
+  return addresses[bestIndex]
 }