diff --git a/src/api/__tests__/unified-inbox-live-account.test.ts b/src/api/__tests__/unified-inbox-live-account.test.ts
new file mode 100644
index 00000000..4935cf34
--- /dev/null
+++ b/src/api/__tests__/unified-inbox-live-account.test.ts
@@ -0,0 +1,78 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { createFakeJmap } from '../../stores/__tests__/fake-jmap-server';
+
+// The unified views use the connected client for the live account and stored
+// credentials for the others. Which account is live followed the old
+// host-only id rule, so with a client signed in to :8016 an account from the
+// days before ports (me@10.10.10.62, on :8120) was taken for the live one and
+// asked the :8016 server for its mail. The live account's id is the one
+// generateAccountId gives, registry included.
+
+const server = vi.hoisted(() => ({ current: null as null | ReturnType<typeof import('../../stores/__tests__/fake-jmap-server').createFakeJmap> }));
+const client = vi.hoisted(() => ({
+  request: null as unknown as ReturnType<typeof import('vitest').vi.fn>,
+  getStoredCredentials: null as unknown as ReturnType<typeof import('vitest').vi.fn>,
+}));
+
+vi.mock('../jmap-client', () => {
+  client.request = vi.fn(async (calls: Array<[string, Record<string, unknown>, string]>) => {
+    if (calls[0][0] === 'Mailbox/get') {
+      const accountId = calls[0][1].accountId as string;
+      return { methodResponses: [['Mailbox/get', { accountId, list: [{ id: `${accountId}-in`, role: 'inbox', name: 'Inbox' }] }, calls[0][2]]] };
+    }
+    return server.current!.request(calls as never);
+  });
+  client.getStoredCredentials = vi.fn(async () => null);
+  return {
+    jmapClient: {
+      isConnected: true,
+      accountId: 'c',
+      username: 'me',
+      serverUrl: 'http://10.10.10.62:8016',
+      currentSession: { apiUrl: 'http://10.10.10.62:8016/jmap/', accounts: {} },
+      getSharedMailAccounts: () => [],
+      request: client.request,
+      getStoredCredentials: client.getStoredCredentials,
+    },
+    rewriteSessionUrl: (u: string) => u,
+    extractOrigin: (u: string) => u,
+    parseRetryAfter: () => 0,
+    REQUEST_TIMEOUT_MS: 30000,
+  };
+});
+
+import { fetchUnifiedInbox, resetUnifiedCache } from '../unified-inbox';
+import { setKnownAccounts } from '../../lib/account-utils';
+
+const OLD_8120 = 'me@10.10.10.62';
+const LIVE_8016 = 'me@10.10.10.62:8016';
+
+beforeEach(() => {
+  resetUnifiedCache();
+  client.request.mockClear();
+  client.getStoredCredentials.mockClear();
+  server.current = createFakeJmap({
+    c: [{
+      id: 'a', threadId: 't-a', size: 1, hasAttachment: false, mailboxIds: { 'c-in': true }, keywords: {},
+      receivedAt: '2026-10-20T10:00:00Z', subject: 'On 8016', preview: '',
+    }],
+  });
+  setKnownAccounts([
+    { id: OLD_8120, username: 'me', serverUrl: 'http://10.10.10.62:8120' },
+    { id: LIVE_8016, username: 'me', serverUrl: 'http://10.10.10.62:8016' },
+  ]);
+});
+
+describe('the live account in the unified views', () => {
+  it('is not an older host-only account on another port of the same host', async () => {
+    await fetchUnifiedInbox([OLD_8120], 25, {}).catch(() => undefined);
+    expect(client.request).not.toHaveBeenCalled();
+    expect(client.getStoredCredentials).toHaveBeenCalledWith(OLD_8120);
+  });
+
+  it('is the account with the port the client is signed in to', async () => {
+    const result = await fetchUnifiedInbox([LIVE_8016], 25, {});
+    expect(client.getStoredCredentials).not.toHaveBeenCalled();
+    expect(result.emails.map((e) => e.subject)).toEqual(['On 8016']);
+  });
+});
diff --git a/src/api/unified-inbox.ts b/src/api/unified-inbox.ts
index 4cdd67ce..83acd9a3 100644
--- a/src/api/unified-inbox.ts
+++ b/src/api/unified-inbox.ts
@@ -12,6 +12,7 @@ import {
   filterHasSnippetTerms, snippetFilterFor, type SearchSnippetResult, type SnippetBatch,
 } from '../lib/search-snippet';
 import { LIST_AUTH_RESULTS_PROPERTY } from '../lib/email-headers';
+import { generateAccountId } from '../lib/account-utils';
 
 // Aggregated views across accounts ("All inboxes", "All Sent", All mail /
 // Unread / Starred). Because the JMAP client is a single-account singleton
@@ -208,10 +209,9 @@ function isLiveAccount(accountId: string): boolean {
   const username = jmapClient.username;
   const serverUrl = jmapClient.serverUrl;
   if (!username || !serverUrl) return false;
-  // Same rule as generateAccountId(username, serverUrl) in lib/account-utils.
-  let host = serverUrl;
-  try { host = new URL(serverUrl).hostname; } catch { host = serverUrl.replace(/^https?:\/\//, '').replace(/\/.*$/, ''); }
-  return `${username}@${host}` === accountId;
+  // With the port, and the registry's host-only id where the account kept
+  // one: a client on :8016 is not an old host-only account on :8120.
+  return generateAccountId(username, serverUrl) === accountId;
 }
 
 async function entryFor(accountId: string): Promise<AccountEntry> {