From 6859bc0ba21258e4c7e76f10fac8deeba4364493 Mon Sep 17 00:00:00 2001
From: Dorian Niemiec <dorian.niemiec@svrjs.org>
Date: Tue, 17 Sep 2024 07:48:57 +0200
Subject: [PATCH] fix: improve the email domain validation in the contact API

---
 app/api/contact/route.ts | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/app/api/contact/route.ts b/app/api/contact/route.ts
index 022b818..389d6d0 100644
--- a/app/api/contact/route.ts
+++ b/app/api/contact/route.ts
@@ -136,7 +136,24 @@ export async function POST(req: NextRequest) {
     let isEmailHostValid = false;
     try {
       const mxRecords = await dns.resolveMx(emailDomain);
-      if (mxRecords.length > 0) isEmailHostValid = true;
+      if (mxRecords.length > 0) {
+        for (let i = 0; i < mxRecords.length; i++) {
+          try {
+            const aRecords = await dns.resolve4(mxRecords[i].exchange);
+            if (aRecords.length > 0) {
+              isEmailHostValid = true;
+              break;
+            }
+          } catch (err) {}
+          try {
+            const aaaaRecords = await dns.resolve6(mxRecords[i].exchange);
+            if (aaaaRecords.length > 0) {
+              isEmailHostValid = true;
+              break;
+            }
+          } catch (err) {}
+        }
+      }
     } catch (err) {}
     if (!isEmailHostValid) {
       return NextResponse.json(