attempt to fix mail sending

app/services/invoice/safeFetch.server.ts

@@ -170,11 +170,42 @@ export async function safeFetch(rawUrl: string, opts: SafeFetchOptions = {}): Pr
   // Pin the resolved IP. We pass an Agent with a custom `lookup` that always
   // returns our pre-validated address, so the actual TCP connect can't be
   // re-resolved to something else (DNS-rebinding defense).
+  //
+  // Note: Node 20+ enables Happy Eyeballs (`autoSelectFamily: true`) by
+  // default on the http/https agents. Happy Eyeballs calls `lookup` with
+  // `{ all: true }` and expects the callback to receive an *array* of
+  // `{ address, family }` records. If we ignore that and always invoke the
+  // 3-arg form, the connector hands `undefined` to `socket.connect()`,
+  // which then throws `Invalid IP address: undefined`.
+  type LookupCb =
+    | ((err: NodeJS.ErrnoException | null, address: string, family: number) => void)
+    | ((err: NodeJS.ErrnoException | null, addresses: { address: string; family: number }[]) => void);
   const pinnedLookup = (
     _hostname: string,
-    _options: unknown,
-    cb: (err: NodeJS.ErrnoException | null, address: string, family: number) => void,
-  ) => cb(null, address, family);
+    optionsOrCb: { all?: boolean; family?: number } | LookupCb,
+    maybeCb?: LookupCb,
+  ) => {
+    let options: { all?: boolean; family?: number } = {};
+    let cb: LookupCb;
+    if (typeof optionsOrCb === "function") {
+      cb = optionsOrCb;
+    } else {
+      options = optionsOrCb ?? {};
+      cb = maybeCb as LookupCb;
+    }
+    if (options.all) {
+      (cb as (err: NodeJS.ErrnoException | null, addresses: { address: string; family: number }[]) => void)(
+        null,
+        [{ address, family }],
+      );
+    } else {
+      (cb as (err: NodeJS.ErrnoException | null, address: string, family: number) => void)(
+        null,
+        address,
+        family,
+      );
+    }
+  };
 
   const isHttps = url.protocol === "https:";
   const agent = isHttps