fix: Improve email verification logic by prioritizing MX record checks and clarifying domain existence validation

apps/api/src/services/EmailVerificationService.ts

@@ -42,8 +42,8 @@ export class EmailVerificationService {
 
   /**
    * Verify an email address
-   * - Checks if domain exists (DNS A/AAAA records)
+   * - Checks for MX records (required for receiving email)
-   * - Checks for MX records
+   * - Checks if domain exists (DNS A/AAAA records) - informational only
    * - Detects disposable email addresses
    * - Detects forwarding/alias email addresses
    * - Suggests corrections for common typos
@@ -88,24 +88,8 @@ export class EmailVerificationService {
       result.isTypo = true;
     }
 
-    // Check if domain exists (has any DNS records)
+    // Check MX records first - this is what matters for email delivery
-    try {
+    // A domain can receive email with only MX records, no A/AAAA records needed
-      await dns.resolve(domain, 'A');
-      result.domainExists = true;
-    } catch {
-      // Try AAAA records if A records fail
-      try {
-        await dns.resolve(domain, 'AAAA');
-        result.domainExists = true;
-      } catch {
-        result.domainExists = false;
-        result.valid = false;
-        result.reasons.push('Domain does not exist');
-      }
-    }
-
-    // Check MX records (only if domain exists)
-    if (result.domainExists) {
     try {
       const mxRecords = await dns.resolveMx(domain);
       result.hasMxRecords = mxRecords && mxRecords.length > 0;
@@ -118,6 +102,21 @@ export class EmailVerificationService {
       result.valid = false;
       result.reasons.push('No MX records found for domain');
     }
+
+    // Check if domain exists (has A/AAAA records) - informational only
+    // This doesn't affect validity since email delivery only requires MX records
+    try {
+      await dns.resolve(domain, 'A');
+      result.domainExists = true;
+    } catch {
+      // Try AAAA records if A records fail
+      try {
+        await dns.resolve(domain, 'AAAA');
+        result.domainExists = true;
+      } catch {
+        // Domain doesn't have A/AAAA records, but this is OK if it has MX records
+        result.domainExists = false;
+      }
     }
 
     // If no issues were found, add a success reason