Probe known DKIM selectors during DNS import

src/dns/import.ts

@@ -1,14 +1,20 @@
+import { KNOWN_DKIM_PROVIDERS } from "../email/dkim-providers";
 import type { RecordType, Zone, ZoneRecord } from "../zone/types";
 import { query } from "./query";
 import { DEFAULT_RESOLVERS } from "./resolvers";
 import type { DohAnswer } from "./types";
 
 const APEX_TYPES: RecordType[] = ["SOA", "NS", "A", "AAAA", "MX", "TXT", "CAA"];
+
 const SUBDOMAIN_PROBES: Array<{ name: string; types: RecordType[] }> = [
   { name: "www", types: ["A", "AAAA", "CNAME"] },
   { name: "_dmarc", types: ["TXT"] },
   { name: "mail", types: ["A", "AAAA", "CNAME"] },
   { name: "autodiscover", types: ["CNAME"] },
+  ...Object.keys(KNOWN_DKIM_PROVIDERS).map((sel) => ({
+    name: `${sel}._domainkey`,
+    types: ["TXT", "CNAME"] as RecordType[],
+  })),
 ];
 
 export interface DnsImportResult {

src/email/checks.ts

@@ -12,23 +12,7 @@ export interface EmailCheck {
   records: ZoneRecord[];
 }
 
-const KNOWN_DKIM_PROVIDERS: Record<string, string> = {
-  google: "Google Workspace",
-  selector1: "Microsoft 365",
-  selector2: "Microsoft 365",
-  mailgun: "Mailgun",
-  k1: "Mailchimp",
-  k2: "Mailchimp",
-  k3: "Mailchimp",
-  pm: "Postmark",
-  sendgrid: "SendGrid",
-  s1: "SendGrid",
-  s2: "SendGrid",
-  zoho: "Zoho",
-  amazonses: "Amazon SES",
-  ahasend: "AhaSend",
-  ahasend2: "AhaSend",
-};
+import { KNOWN_DKIM_PROVIDERS } from "./dkim-providers";
 
 function stripTrailingDot(s: string): string {
   return s.replace(/\.$/, "");

src/email/dkim-providers.ts

@@ -0,0 +1,19 @@
+/** Known DKIM selectors mapped to their provider display name. */
+export const KNOWN_DKIM_PROVIDERS: Record<string, string> = {
+  google: "Google Workspace",
+  selector1: "Microsoft 365",
+  selector2: "Microsoft 365",
+  mailgun: "Mailgun",
+  k1: "Mailchimp",
+  k2: "Mailchimp",
+  k3: "Mailchimp",
+  pm: "Postmark",
+  sendgrid: "SendGrid",
+  s1: "SendGrid",
+  s2: "SendGrid",
+  zoho: "Zoho",
+  amazonses: "Amazon SES",
+  ahasend: "AhaSend",
+  ahasend2: "AhaSend",
+  protonmail: "Proton Mail",
+};