diff --git a/stores/__tests__/email-store-plugin-mailbox-hooks.test.ts b/stores/__tests__/email-store-plugin-mailbox-hooks.test.ts
new file mode 100644
index 000000000..bd0eb48cb
--- /dev/null
+++ b/stores/__tests__/email-store-plugin-mailbox-hooks.test.ts
@@ -0,0 +1,192 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import { useEmailStore } from '../email-store';
+import { useAuthStore } from '../auth-store';
+import { useSettingsStore } from '@/stores/settings-store';
+import { clearAllHooks, emailHooks } from '@/lib/plugin-hooks';
+import type { Mailbox } from '@/lib/jmap/types';
+import type { IJMAPClient } from '@/lib/jmap/client-interface';
+
+// Folder hooks: create, rename, delete, empty, the refreshed folder list and
+// the storage quota.
+
+function makeMailbox(overrides: Partial<Mailbox>): Mailbox {
+  return {
+    id: 'inbox',
+    name: 'Inbox',
+    sortOrder: 0,
+    totalEmails: 0,
+    unreadEmails: 0,
+    totalThreads: 0,
+    unreadThreads: 0,
+    isSubscribed: true,
+    isShared: false,
+    myRights: { mayRename: true, mayDelete: true },
+    ...overrides,
+  } as Mailbox;
+}
+
+const mailboxes = [
+  makeMailbox({ id: 'inbox', role: 'inbox', totalEmails: 4, unreadEmails: 1 }),
+  makeMailbox({ id: 'projects', name: 'Projects', parentId: 'inbox' }),
+  makeMailbox({ id: 'junk', name: 'Junk', role: 'junk', totalEmails: 7 }),
+  makeMailbox({ id: 'trash', name: 'Trash', role: 'trash' }),
+];
+
+let client: IJMAPClient;
+
+beforeEach(() => {
+  clearAllHooks();
+  client = {
+    getAccountId: () => 'me',
+    createMailbox: vi.fn().mockResolvedValue(makeMailbox({ id: 'new-1', name: 'Receipts' })),
+    updateMailbox: vi.fn().mockResolvedValue(undefined),
+    deleteMailbox: vi.fn().mockResolvedValue(undefined),
+    emptyMailbox: vi.fn().mockResolvedValue(undefined),
+    moveMailboxContents: vi.fn().mockResolvedValue(undefined),
+    getAllMailboxes: vi.fn().mockResolvedValue(mailboxes),
+    // A fresh object per read, as from the server.
+    getQuota: vi.fn().mockImplementation(async () => ({ used: 50, total: 200 })),
+  } as unknown as IJMAPClient;
+  useAuthStore.setState({ activeAccountId: 'acct', getClientForAccount: () => client as never } as never);
+  useSettingsStore.setState({ deleteAction: 'trash' } as never);
+  useEmailStore.setState({
+    mailboxes,
+    accountMailboxes: {},
+    viewingAccountId: null,
+    selectedMailbox: 'inbox',
+    emails: [],
+    quota: null,
+    error: null,
+  });
+});
+
+afterEach(() => clearAllHooks());
+
+describe('folder hooks', () => {
+  it('asks before creating a folder and reports the new folder', async () => {
+    const before = vi.fn(() => true);
+    const after = vi.fn();
+    emailHooks.onBeforeMailboxCreate.register('t', before);
+    emailHooks.onMailboxCreate.register('t', after);
+
+    await useEmailStore.getState().createMailbox(client, 'Receipts', 'inbox');
+
+    expect(before).toHaveBeenCalledWith({ name: 'Receipts', parentId: 'inbox' });
+    expect(after).toHaveBeenCalledWith({ mailboxId: 'new-1', name: 'Receipts', parentId: 'inbox' });
+  });
+
+  it('creates nothing when a plugin refuses', async () => {
+    const after = vi.fn();
+    emailHooks.onBeforeMailboxCreate.register('t', () => false);
+    emailHooks.onMailboxCreate.register('t', after);
+
+    await useEmailStore.getState().createMailbox(client, 'Receipts');
+
+    expect(client.createMailbox).not.toHaveBeenCalled();
+    expect(after).not.toHaveBeenCalled();
+  });
+
+  it('does not report a folder the server refused to create', async () => {
+    vi.mocked(client.createMailbox).mockRejectedValue(new Error('nope'));
+    const after = vi.fn();
+    emailHooks.onMailboxCreate.register('t', after);
+
+    await expect(useEmailStore.getState().createMailbox(client, 'Receipts')).rejects.toThrow('nope');
+    expect(after).not.toHaveBeenCalled();
+  });
+
+  it('reports a rename with the previous name', async () => {
+    const before = vi.fn(() => true);
+    const after = vi.fn();
+    emailHooks.onBeforeMailboxRename.register('t', before);
+    emailHooks.onMailboxRename.register('t', after);
+
+    await useEmailStore.getState().renameMailbox(client, 'projects', 'Work');
+
+    expect(before).toHaveBeenCalledWith({ mailboxId: 'projects', name: 'Work' });
+    expect(after).toHaveBeenCalledWith({ mailboxId: 'projects', name: 'Work', previousName: 'Projects' });
+  });
+
+  it('keeps the name when a plugin refuses a rename', async () => {
+    emailHooks.onBeforeMailboxRename.register('t', () => false);
+
+    await useEmailStore.getState().renameMailbox(client, 'projects', 'Work');
+
+    expect(client.updateMailbox).not.toHaveBeenCalled();
+    expect(useEmailStore.getState().mailboxes.find(m => m.id === 'projects')?.name).toBe('Projects');
+  });
+
+  it('asks before deleting a folder and reports it', async () => {
+    const before = vi.fn(() => true);
+    const after = vi.fn();
+    emailHooks.onBeforeMailboxDelete.register('t', before);
+    emailHooks.onMailboxDelete.register('t', after);
+
+    await useEmailStore.getState().deleteMailbox(client, 'projects');
+
+    expect(before).toHaveBeenCalledWith({ mailboxId: 'projects', name: 'Projects' });
+    expect(after).toHaveBeenCalledWith({ mailboxId: 'projects', name: 'Projects' });
+  });
+
+  it('keeps a folder a plugin refuses to delete', async () => {
+    emailHooks.onBeforeMailboxDelete.register('t', () => false);
+
+    await useEmailStore.getState().deleteMailbox(client, 'projects');
+
+    expect(client.deleteMailbox).not.toHaveBeenCalled();
+    expect(useEmailStore.getState().mailboxes.some(m => m.id === 'projects')).toBe(true);
+  });
+
+  it('asks before emptying a folder and reports how many messages it held', async () => {
+    const before = vi.fn(() => true);
+    const after = vi.fn();
+    emailHooks.onBeforeMailboxEmpty.register('t', before);
+    emailHooks.onMailboxEmpty.register('t', after);
+
+    await useEmailStore.getState().emptyMailbox(client, 'junk');
+
+    expect(before).toHaveBeenCalledWith({ mailboxId: 'junk', role: 'junk' });
+    expect(after).toHaveBeenCalledWith({ mailboxId: 'junk', role: 'junk', count: 7 });
+  });
+
+  it('leaves a folder full when a plugin refuses to empty it', async () => {
+    const after = vi.fn();
+    emailHooks.onBeforeMailboxEmpty.register('t', () => false);
+    emailHooks.onMailboxEmpty.register('t', after);
+
+    await useEmailStore.getState().emptyMailbox(client, 'junk');
+
+    expect(client.emptyMailbox).not.toHaveBeenCalled();
+    expect(useEmailStore.getState().mailboxes.find(m => m.id === 'junk')?.totalEmails).toBe(7);
+    expect(after).not.toHaveBeenCalled();
+  });
+
+  it('hands plugins plain folder views on refresh', async () => {
+    const refreshed = vi.fn();
+    emailHooks.onMailboxesRefresh.register('t', refreshed);
+
+    await useEmailStore.getState().fetchMailboxes(client);
+
+    expect(refreshed).toHaveBeenCalledTimes(1);
+    expect(refreshed.mock.calls[0][0][1]).toEqual({
+      id: 'projects', name: 'Projects', role: null, totalEmails: 0, unreadEmails: 0, parentId: 'inbox',
+    });
+  });
+});
+
+describe('quota hook', () => {
+  it('reports the quota when it was read and changed, not when it stayed the same', async () => {
+    const changed = vi.fn();
+    emailHooks.onQuotaChange.register('t', changed);
+
+    await useEmailStore.getState().fetchQuota(client);
+    await useEmailStore.getState().fetchQuota(client);
+    vi.mocked(client.getQuota).mockImplementation(async () => ({ used: 60, total: 200 }));
+    await useEmailStore.getState().fetchQuota(client);
+
+    expect(changed.mock.calls).toEqual([
+      [{ used: 50, total: 200, percentUsed: 25 }],
+      [{ used: 60, total: 200, percentUsed: 30 }],
+    ]);
+  });
+});
diff --git a/stores/__tests__/folder-management.test.ts b/stores/__tests__/folder-management.test.ts
index 4e9d3816b..ee9e53eba 100644
--- a/stores/__tests__/folder-management.test.ts
+++ b/stores/__tests__/folder-management.test.ts
@@ -5,6 +5,7 @@ import type { Mailbox } from '@/lib/jmap/types';
 import type { IJMAPClient } from '@/lib/jmap/client-interface';
 import { UNIFIED_MAILBOX_IDS } from '@/lib/jmap/types';
 import { emailHooks } from '@/lib/plugin-hooks';
+import { mailboxToView } from '@/lib/plugin-mail-hooks';
 
 function makeMailbox(overrides: Partial<Mailbox> = {}): Mailbox {
   return {
@@ -454,7 +455,7 @@ describe('email-store folder management', () => {
 
       try {
         await useEmailStore.getState().fetchMailboxes(client);
-        expect(observer).toHaveBeenCalledWith(refreshed);
+        expect(observer).toHaveBeenCalledWith(refreshed.map(mailboxToView));
       } finally {
         disposable.dispose();
       }
diff --git a/stores/email-store.ts b/stores/email-store.ts
index 8c23ef488..6ab2e5802 100644
--- a/stores/email-store.ts
+++ b/stores/email-store.ts
@@ -7,7 +7,7 @@ import { useCalendarStore } from "@/stores/calendar-store";
 import { orderKeywords, placeHeldRows, type HeldKeywords, type SortLevel } from "@/lib/message-list-order";
 import { SearchFilters, DEFAULT_SEARCH_FILTERS, buildJMAPFilter, isFilterEmpty } from "@/lib/jmap/search-utils";
 import { emailHooks } from "@/lib/plugin-hooks";
-import { allowEmailMove, emitEmailMove, keywordChangeLists } from "@/lib/plugin-mail-hooks";
+import { allowEmailMove, emitEmailMove, keywordChangeLists, mailboxToView, quotaToView } from "@/lib/plugin-mail-hooks";
 import { resolveThreadRoute } from "@/lib/thread-routing";
 import { emailKeyFor, threadKeyFor, threadIdFromKey, KEYWORD_PREFIX, KEYWORD_PREFIX_LEGACY } from "@/lib/thread-utils";
 import type { ExternalSearchResult } from "@/lib/plugin-types";
@@ -2179,7 +2179,7 @@ export const useEmailStore = create<EmailStore>((set, get) => ({
       // Publish the existing mailbox-refresh extension hook after a successful
       // fetch. This is also emitted for Mailbox-only state changes (for example
       // an empty provider label), where no Email fetch follows.
-      await emailHooks.onMailboxesRefresh.emit(mailboxes);
+      if (emailHooks.onMailboxesRefresh.size > 0) await emailHooks.onMailboxesRefresh.emit(mailboxes.map(mailboxToView));
       if (stale()) return;
 
       // Auto-select inbox if no mailbox is selected or the current selection
@@ -4626,7 +4626,7 @@ export const useEmailStore = create<EmailStore>((set, get) => ({
     if (patched) {
       // Same extension hook a full refresh publishes, so plugins that mirror
       // folder counters see delta updates too.
-      await emailHooks.onMailboxesRefresh.emit(mailboxes);
+      if (emailHooks.onMailboxesRefresh.size > 0) await emailHooks.onMailboxesRefresh.emit(mailboxes.map(mailboxToView));
     }
     return true;
   },
@@ -5322,7 +5322,12 @@ export const useEmailStore = create<EmailStore>((set, get) => ({
       const target = parentId
         ? resolveMailboxMutationContext(client, parentId)
         : { ...resolveMailboxAccountTarget(client, accountId), mailboxId: undefined };
-      await target.client.createMailbox(name, target.mailboxId, target.accountId);
+      if (emailHooks.onBeforeMailboxCreate.size > 0
+        && !(await emailHooks.onBeforeMailboxCreate.intercept({ name, parentId: parentId ?? null }))) {
+        return;
+      }
+      const created = await target.client.createMailbox(name, target.mailboxId, target.accountId);
+      void emailHooks.onMailboxCreate.emit({ mailboxId: created?.id ?? null, name, parentId: parentId ?? null });
       if (get().viewingAccountId) {
         await refreshMailboxesForViewingAccount(client);
       } else {
@@ -5337,7 +5342,13 @@ export const useEmailStore = create<EmailStore>((set, get) => ({
   renameMailbox: async (client, mailboxId, name) => {
     try {
       const target = resolveMailboxMutationContext(client, mailboxId);
+      if (emailHooks.onBeforeMailboxRename.size > 0
+        && !(await emailHooks.onBeforeMailboxRename.intercept({ mailboxId, name }))) {
+        return;
+      }
+      const previousName = resolveActionMailboxes().find(mb => mb.id === mailboxId)?.name ?? null;
       await target.client.updateMailbox(target.mailboxId, { name }, target.accountId);
+      void emailHooks.onMailboxRename.emit({ mailboxId, name, previousName });
       const viewingId = get().viewingAccountId;
       if (viewingId) {
         set((state) => ({
@@ -5364,6 +5375,11 @@ export const useEmailStore = create<EmailStore>((set, get) => ({
   deleteMailbox: async (client, mailboxId, options) => {
     try {
       const target = resolveMailboxMutationContext(client, mailboxId);
+      const deletedName = resolveActionMailboxes().find(mb => mb.id === mailboxId)?.name ?? null;
+      if (emailHooks.onBeforeMailboxDelete.size > 0
+        && !(await emailHooks.onBeforeMailboxDelete.intercept({ mailboxId, name: deletedName }))) {
+        return;
+      }
       // Only pass the options when set: the plain call keeps the two-argument
       // shape other client implementations (demo, plugins) expect.
       if (options?.removeEmails) {
@@ -5371,6 +5387,7 @@ export const useEmailStore = create<EmailStore>((set, get) => ({
       } else {
         await target.client.deleteMailbox(target.mailboxId, target.accountId);
       }
+      void emailHooks.onMailboxDelete.emit({ mailboxId, name: deletedName });
       const { selectedMailbox, viewingAccountId: viewingId } = get();
       if (viewingId) {
         const updatedList = (get().accountMailboxes[viewingId] ?? []).filter(mb => mb.id !== mailboxId);
@@ -5585,6 +5602,11 @@ export const useEmailStore = create<EmailStore>((set, get) => ({
   },
 
   emptyMailbox: async (client, mailboxId) => {
+    const emptied = resolveActionMailboxes().find(mb => mb.id === mailboxId);
+    if (emailHooks.onBeforeMailboxEmpty.size > 0
+      && !(await emailHooks.onBeforeMailboxEmpty.intercept({ mailboxId, role: emptied?.role ?? null }))) {
+      return;
+    }
     try {
       set({ isLoading: true, error: null });
       const mailboxes = resolveActionMailboxes();
@@ -5643,6 +5665,7 @@ export const useEmailStore = create<EmailStore>((set, get) => ({
         set({ mailboxes: get().mailboxes.map(updateCounters) });
       }
       set({ isLoading: false });
+      void emailHooks.onMailboxEmpty.emit({ mailboxId, role: mailbox?.role ?? null, count: mailbox?.totalEmails ?? 0 });
     } catch (error) {
       set({
         error: error instanceof Error ? error.message : 'Failed to empty folder',
@@ -6243,6 +6266,16 @@ export const useEmailStore = create<EmailStore>((set, get) => ({
   },
 }));
 
+// Plugin hooks that follow a piece of store state rather than one action, so
+// every path that changes it (clicks, keyboard, a batch action clearing the
+// selection, an account switch) fires them once.
+useEmailStore.subscribe((state, prev) => {
+  if (state.quota && state.quota !== prev.quota
+    && (state.quota.used !== prev.quota?.used || state.quota.total !== prev.quota?.total)) {
+    void emailHooks.onQuotaChange.emit(quotaToView(state.quota));
+  }
+});
+
 // Keep the unified-section badges in lockstep with the live per-account mailbox
 // lists. Whenever `mailboxes`, `accountMailboxes`, or the unified scope change -
 // i.e. after any optimistic delete/move/markRead patch or a push-driven mailbox