feat(routes,email): persist system DNS routes with runtime hydration and add reusable email ops DNS helpers

test/test.email-dns-records.node.ts

@@ -0,0 +1,65 @@
+import { tap, expect } from '@git.zone/tstest/tapbundle';
+import { buildEmailDnsRecords } from '../ts/email/index.js';
+
+tap.test('buildEmailDnsRecords uses the configured mail hostname for MX and includes DKIM when provided', async () => {
+  const records = buildEmailDnsRecords({
+    domain: 'example.com',
+    hostname: 'mail.example.com',
+    selector: 'selector1',
+    dkimValue: 'v=DKIM1; h=sha256; k=rsa; p=abc123',
+    statuses: {
+      mx: 'valid',
+      spf: 'missing',
+      dkim: 'valid',
+      dmarc: 'unchecked',
+    },
+  });
+
+  expect(records).toEqual([
+    {
+      type: 'MX',
+      name: 'example.com',
+      value: '10 mail.example.com',
+      status: 'valid',
+    },
+    {
+      type: 'TXT',
+      name: 'example.com',
+      value: 'v=spf1 a mx ~all',
+      status: 'missing',
+    },
+    {
+      type: 'TXT',
+      name: 'selector1._domainkey.example.com',
+      value: 'v=DKIM1; h=sha256; k=rsa; p=abc123',
+      status: 'valid',
+    },
+    {
+      type: 'TXT',
+      name: '_dmarc.example.com',
+      value: 'v=DMARC1; p=none; rua=mailto:dmarc@example.com',
+      status: 'unchecked',
+    },
+  ]);
+});
+
+tap.test('buildEmailDnsRecords omits DKIM when no value is provided', async () => {
+  const records = buildEmailDnsRecords({
+    domain: 'example.net',
+    hostname: 'smtp.example.net',
+    mxPriority: 20,
+  });
+
+  expect(records.map((record) => record.name)).toEqual([
+    'example.net',
+    'example.net',
+    '_dmarc.example.net',
+  ]);
+  expect(records[0].value).toEqual('20 smtp.example.net');
+});
+
+tap.test('cleanup', async () => {
+  await tap.stopForcefully();
+});
+
+export default tap.start();