diff --git a/backend/tests/plugins/test_antispam_api.py b/backend/tests/plugins/test_antispam_api.py
index b0e0a18..274b612 100644
--- a/backend/tests/plugins/test_antispam_api.py
+++ b/backend/tests/plugins/test_antispam_api.py
@@ -7,6 +7,8 @@ tables. Requires the plugin installed and `install antispam` run.
 
 from __future__ import annotations
 
+import importlib
+import types
 import uuid
 from collections.abc import AsyncIterator
 
@@ -32,6 +34,29 @@ from app.models import User
 BASE = "/api/plugins/antispam"
 
 
+class _SdkProxy:
+    """The router's SDK handle with a few calls swapped out. The SDK object is a
+    frozen dataclass, and `.messages` / `.accounts` hand out a fresh object on
+    every access, so patching attributes on them does not stick."""
+
+    def __init__(self, real: object, **overrides: object) -> None:
+        self._real = real
+        self._overrides = overrides
+
+    def __getattr__(self, name: str) -> object:
+        if name in self._overrides:
+            return self._overrides[name]
+        return getattr(self._real, name)
+
+
+def _router_module() -> object:
+    return importlib.import_module("webmail_plugin_antispam.router")
+
+
+async def _raw(*_a: object, **_k: object) -> bytes:
+    return b"Subject: x\r\n\r\nbody"
+
+
 async def _mk_user(sm: async_sessionmaker) -> uuid.UUID:  # type: ignore[type-arg]
     async with sm() as s:
         user = User(
@@ -188,18 +213,82 @@ async def test_ui_bundles_are_served_and_gated(ctx: _Ctx) -> None:
     assert (await ctx.client_a.get(f"{BASE}/ui/../hook.py")).status_code == 404
 
 
-async def test_learn_records_even_without_a_prior_verdict(ctx: _Ctx) -> None:
+async def test_learn_records_even_without_a_prior_verdict(
+    ctx: _Ctx, monkeypatch: pytest.MonkeyPatch
+) -> None:
     """Mail the provider filed as spam has no verdict row of ours to update.
 
     The write must therefore upsert — and it must happen before the move, or the
     passive-learning hook re-teaches the lesson the move announces.
     """
+    router_mod = _router_module()
+
+    async def _accepted(_raw: bytes, **_kw: object) -> bool:
+        return True
+
+    monkeypatch.setattr(
+        router_mod,
+        "_SDK",
+        _SdkProxy(router_mod._SDK, messages=_SdkProxy(router_mod._SDK.messages, raw=_raw)),
+    )
+    monkeypatch.setattr(rspamd_mod, "learn", _accepted)
     message_id = uuid.uuid4()
     r = await ctx.client_a.post(
         f"{BASE}/learn", json={"message_id": str(message_id), "verdict": "spam"}
     )
     assert r.status_code == 200
+    assert r.json()["taught"] is True
     assert r.json()["moved"] is False  # not this user's message: nothing to move
 
     body = (await ctx.client_a.get(f"{BASE}/context/{message_id}")).json()
     assert body["verdict"]["learned"] == "spam"
+
+
+async def test_a_refused_lesson_is_not_recorded(ctx: _Ctx, monkeypatch: pytest.MonkeyPatch) -> None:
+    """The engine said no (a 401 from a mismatched controller password, say).
+
+    Recording it anyway made the menu say "Marked as spam" for a lesson never
+    taught, and its dedup then blocked every retry.
+    """
+    router_mod = _router_module()
+
+    async def _refused(_raw: bytes, **_kw: object) -> bool:
+        return False
+
+    monkeypatch.setattr(
+        router_mod,
+        "_SDK",
+        _SdkProxy(router_mod._SDK, messages=_SdkProxy(router_mod._SDK.messages, raw=_raw)),
+    )
+    monkeypatch.setattr(rspamd_mod, "learn", _refused)
+    message_id = uuid.uuid4()
+    r = await ctx.client_a.post(
+        f"{BASE}/learn", json={"message_id": str(message_id), "verdict": "spam"}
+    )
+    assert r.status_code == 200
+    assert r.json()["taught"] is False
+    body = (await ctx.client_a.get(f"{BASE}/context/{message_id}")).json()
+    assert body["verdict"] is None
+
+
+async def test_bootstrap_now_queues_only_this_users_accounts(
+    ctx: _Ctx, monkeypatch: pytest.MonkeyPatch
+) -> None:
+    router_mod = _router_module()
+    mine, theirs = uuid.uuid4(), uuid.uuid4()
+    queued: list[dict[str, object]] = []
+
+    async def _live() -> list[tuple[uuid.UUID, uuid.UUID]]:
+        return [(ctx.user_a, mine), (ctx.user_b, theirs)]
+
+    async def _enqueue(_func: object, **kwargs: object) -> None:
+        queued.append(kwargs)
+
+    monkeypatch.setattr(
+        router_mod,
+        "_SDK",
+        _SdkProxy(router_mod._SDK, accounts=types.SimpleNamespace(live=_live), enqueue=_enqueue),
+    )
+    r = await ctx.client_a.post(f"{BASE}/bootstrap")
+    assert r.json() == {"queued": 1}
+    assert queued == [{"user_id": str(ctx.user_a), "account_id": str(mine), "force": True}]
diff --git a/backend/tests/plugins/test_antispam_learning.py b/backend/tests/plugins/test_antispam_learning.py
index 2df9e3c..9646c92 100644
--- a/backend/tests/plugins/test_antispam_learning.py
+++ b/backend/tests/plugins/test_antispam_learning.py
@@ -459,3 +459,85 @@ def test_compose_gives_the_app_the_controller_password() -> None:
             f"{rel}: the app containers do not receive RSPAMD_CONTROLLER_PASSWORD — "
             "antispam will classify but never learn"
         )
+
+
+class _BootKv:
+    """A kv store holding a given value per key; records what gets written."""
+
+    def __init__(self, values: dict[str, object]) -> None:
+        self.values = values
+        self.written: list[tuple[str, object]] = []
+
+    async def get(self, key: str, default: object = None) -> object:
+        return self.values.get(key, default)
+
+    async def set(self, key: str, value: object) -> None:
+        self.written.append((key, value))
+
+
+def _boot_fake(kv: _BootKv, taught: list[bool]) -> object:
+    class _M:
+        async def sample(self, *_a: object, **_kw: object) -> list[uuid.UUID]:
+            return [uuid.uuid4() for _ in range(12)]
+
+        async def raw(self, *_a: object, **_k: object) -> bytes:
+            return b"x"
+
+    class _Fake:
+        messages = _M()
+
+        def kv(self, _u: object) -> _BootKv:
+            return kv
+
+        async def publish(self, *_a: object, **_k: object) -> None:
+            taught.append(True)
+
+    return _Fake()
+
+
+@pytest.mark.asyncio
+async def test_an_old_style_marker_does_not_block_the_bootstrap(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    """Markers under the old key may come from the `-0` bug: done, nothing taught."""
+    account = str(uuid.uuid4())
+    kv = _BootKv({"_bootstrapped": [account]})
+    ran: list[bool] = []
+
+    async def _settings(_u: object) -> policy.Settings:
+        return SETTINGS
+
+    async def _ok(_raw: bytes, **_kw: object) -> bool:
+        return True
+
+    monkeypatch.setattr(policy, "load_settings", _settings)
+    monkeypatch.setattr(jobs, "_SDK", _boot_fake(kv, ran))
+    monkeypatch.setattr(jobs.rspamd, "learn", _ok)
+    monkeypatch.setattr(jobs, "PAUSE_SECONDS", 0)
+    await jobs.bootstrap_account({}, user_id=str(uuid.uuid4()), account_id=account)
+    assert ran == [True]
+    assert kv.written == [("bootstrap_done", [account])]
+
+
+@pytest.mark.asyncio
+async def test_done_accounts_are_skipped_unless_forced(monkeypatch: pytest.MonkeyPatch) -> None:
+    account = str(uuid.uuid4())
+
+    async def _settings(_u: object) -> policy.Settings:
+        return SETTINGS
+
+    async def _ok(_raw: bytes, **_kw: object) -> bool:
+        return True
+
+    monkeypatch.setattr(policy, "load_settings", _settings)
+    monkeypatch.setattr(jobs.rspamd, "learn", _ok)
+    monkeypatch.setattr(jobs, "PAUSE_SECONDS", 0)
+
+    kv, ran = _BootKv({"bootstrap_done": [account]}), []
+    monkeypatch.setattr(jobs, "_SDK", _boot_fake(kv, ran))
+    await jobs.bootstrap_account({}, user_id=str(uuid.uuid4()), account_id=account)
+    assert ran == []  # the hourly sweep leaves it alone
+
+    await jobs.bootstrap_account({}, user_id=str(uuid.uuid4()), account_id=account, force=True)
+    assert ran == [True]  # the button re-runs it
+    assert kv.written == []  # already listed: not appended twice
diff --git a/deploy/webmail.sh b/deploy/webmail.sh
index 04f8326..9369f5c 100755
--- a/deploy/webmail.sh
+++ b/deploy/webmail.sh
@@ -397,8 +397,15 @@ print('AUTHORISED')
                 *401*|*Unauthorized*)
                     red "  the api container cannot authenticate to the antispam controller."
                     red "  Mail will still be classified, but NOTHING will be learned."
-                    echo "    RSPAMD_CONTROLLER_PASSWORD reaches rspamd but not api/worker-*."
-                    echo "    fix: webmail.sh update v1.3.2 (or later), which passes it to both"
+                    echo "    The api and rspamd containers hold different controller passwords. Either:"
+                    if [ "$(grep -c RSPAMD_CONTROLLER_PASSWORD "$COMPOSE_FILE")" -lt 3 ]; then
+                        echo "    - ${COMPOSE_FILE} is older than v1.3.2 and does not give the password"
+                        echo "      to api/worker-*. fix: refresh the source tree, keeping .env"
+                        echo "      (docs/nas-install.md §4, 'Refreshing the source tree')"
+                    fi
+                    echo "    - rspamd was started with an older value from .env. fix: webmail.sh update"
+                    echo "      (it recreates rspamd), or just that container:"
+                    echo "      docker compose --env-file .env -f docker-compose.yml up -d --no-deps --force-recreate rspamd"
                     ok=1 ;;
                 *"not running"*|*"No such service"*|*"no such service"*|*"is not running"*)
                     ylw "  antispam not checked — the stack is not running. Start it, then re-run doctor." ;;
@@ -567,6 +574,13 @@ cmd_update() {
     # stack would look updated while missing a container. --no-recreate so this
     # only creates what is absent and leaves the rolled services alone.
     IMAGE_TAG="$target" compose up -d --no-recreate
+    # rspamd holds no state of its own (its Bayes data lives in redis-rspamd), and
+    # it reads RSPAMD_CONTROLLER_PASSWORD only when its container is created. Left
+    # out of the roll it kept whatever password it first started with, so a later
+    # change in .env reached the app but not the engine, and every lesson was
+    # refused with 401 while mail still got classified. Recreating it is a few
+    # seconds of "deliver unclassified", which the filter is built to tolerate.
+    IMAGE_TAG="$target" compose up -d --no-deps --force-recreate rspamd
 
     echo "== 5/5 health gate (${HEALTH_TIMEOUT}s)"
     if health_gate; then
diff --git a/docs/nas-install.md b/docs/nas-install.md
index 99fcee2..f370963 100644
--- a/docs/nas-install.md
+++ b/docs/nas-install.md
@@ -404,6 +404,32 @@ migrations stay expand-then-contract (see `docs/migrations.md` discipline in
 `deployment-setup-instructions.md` §9). For the rare breaking migration, restore
 the dump that `update` took in step 1.
 
+### Refreshing the source tree (installs without git)
+
+`update` replaces the **images**. The files around them — `docker-compose.yml`,
+`deploy/webmail.sh`, `docker/rspamd/local.d` (read by the antispam engine) — come
+from the source tree on the NAS, and change only when that tree does. On an
+install that was unpacked from a tarball rather than cloned, refresh it now and
+then, keeping `.env` and the data directory:
+
+```bash
+cd /share/Container/webmail          # the folder that holds src/
+curl -fsSL -o main.tar.gz http://192.168.1.185:8418/lukas/webmail-client/archive/main.tar.gz
+tar -xzf main.tar.gz                 # unpacks to ./webmail-client
+cp -p src/.env webmail-client/.env
+[ -f src/docker/.env.prod ] && cp -p src/docker/.env.prod webmail-client/docker/.env.prod
+./src/deploy/webmail.sh down         # stop with the OLD files
+mv src src-old-$(date +%Y%m%d)       # kept as a backup
+mv webmail-client src
+chmod +x src/deploy/*.sh src/docker/*.sh
+cd src && ./deploy/webmail.sh up && ./deploy/webmail.sh doctor
+```
+
+`down`/`up` rather than `update`: every container is recreated from the new
+compose file, including the ones `update` leaves alone, and bind mounts point at
+the new folder instead of the renamed one. Data lives in `DATA_ROOT`, outside
+`src/`, and `.env` keeps `IMAGE_TAG`, so the same version comes back up.
+
 ### Building images elsewhere
 
 Building on the NAS is simple but slow and RAM-hungry. Two alternatives:
diff --git a/plugins/webmail_plugin_antispam/webmail_plugin_antispam/jobs.py b/plugins/webmail_plugin_antispam/webmail_plugin_antispam/jobs.py
index efd1643..9ec00c8 100644
--- a/plugins/webmail_plugin_antispam/webmail_plugin_antispam/jobs.py
+++ b/plugins/webmail_plugin_antispam/webmail_plugin_antispam/jobs.py
@@ -48,7 +48,12 @@ PAUSE_SECONDS = 0.05
 MIN_SPAM_CORPUS = 10
 MAX_HAM_RATIO = 3
 
-_DONE_KEY = "_bootstrapped"
+# Accounts whose warm start is done. A new key on purpose: markers under the old
+# one ("_bootstrapped") may have been written by the `-0` bug described in
+# _teach — an account marked done after a total engine outage, with nothing
+# taught, and never retried. Ignoring them costs every older install one repeat
+# bootstrap, which is harmless: rspamd skips messages it has already learned.
+_DONE_KEY = "bootstrap_done"
 
 
 async def _teach(user_id: uuid.UUID, ids: list[uuid.UUID], *, spam: bool) -> int | None:
@@ -75,9 +80,14 @@ async def _teach(user_id: uuid.UUID, ids: list[uuid.UUID], *, spam: bool) -> int
 
 
 async def bootstrap_account(
-    ctx: dict[str, Any], *, user_id: str, account_id: str
+    ctx: dict[str, Any], *, user_id: str, account_id: str, force: bool = False
 ) -> None:
-    """Teach Bayes from one account's existing mail. Safe to call more than once."""
+    """Teach Bayes from one account's existing mail. Safe to call more than once.
+
+    ``force`` runs it even for an account already marked done — the "learn from
+    my Spam folder now" button. The provider-Junk setting still applies: the
+    user turned that off for a reason.
+    """
     uid, acc = uuid.UUID(user_id), uuid.UUID(account_id)
 
     settings = await policy.load_settings(uid)
@@ -85,7 +95,7 @@ async def bootstrap_account(
         return
 
     done = await _SDK.kv(uid).get(_DONE_KEY, [])
-    if account_id in done:
+    if account_id in done and not force:
         return
 
     spam_ids = await _SDK.messages.sample(
@@ -133,7 +143,8 @@ async def bootstrap_account(
         )
         return
 
-    await _SDK.kv(uid).set(_DONE_KEY, [*done, account_id])
+    if account_id not in done:
+        await _SDK.kv(uid).set(_DONE_KEY, [*done, account_id])
     logger.info(
         "antispam bootstrap for %s: learned %d spam, %d ham",
         account_id,
diff --git a/plugins/webmail_plugin_antispam/webmail_plugin_antispam/router.py b/plugins/webmail_plugin_antispam/webmail_plugin_antispam/router.py
index f2038d7..7758985 100644
--- a/plugins/webmail_plugin_antispam/webmail_plugin_antispam/router.py
+++ b/plugins/webmail_plugin_antispam/webmail_plugin_antispam/router.py
@@ -218,7 +218,10 @@ async def learn(body: LearnIn, user_id: CurrentUserId) -> dict[str, object]:
     """Teach this user's Bayes, then file the message accordingly (§C.5).
 
     The move is what the user actually asked for, so it happens even when the
-    engine is unreachable — teaching is best-effort, filing is not.
+    engine is unreachable — teaching is best-effort, filing is not. But only a
+    lesson the engine accepted is recorded: recording a refused one made the menu
+    say "Marked as spam" for nothing, and its dedup then blocked every retry.
+    Left unrecorded, the move below lets the passive hook try again.
     """
     spam = body.verdict == "spam"
     raw = await _SDK.messages.raw(user_id, body.message_id)
@@ -231,12 +234,13 @@ async def learn(body: LearnIn, user_id: CurrentUserId) -> dict[str, object]:
     # the very lesson we just taught. Writing `learned` first makes that hook's
     # dedup see it and stand down. An upsert, because a message the provider
     # filed as spam has no verdict row of ours to update.
-    await _remember_learned(
-        user_id,
-        body.message_id,
-        verdict=body.verdict,
-        action="moved" if spam else "none",
-    )
+    if taught:
+        await _remember_learned(
+            user_id,
+            body.message_id,
+            verdict=body.verdict,
+            action="moved" if spam else "none",
+        )
 
     moved = await _SDK.actions.move_to_special(
         user_id, body.message_id, "junk" if spam else "inbox"
@@ -244,6 +248,24 @@ async def learn(body: LearnIn, user_id: CurrentUserId) -> dict[str, object]:
     return {"status": "ok", "taught": taught, "moved": moved}
 
 
+@router.post("/bootstrap", dependencies=[Depends(require_csrf)])
+async def bootstrap_now(user_id: CurrentUserId) -> dict[str, object]:
+    """ "Learn from my Spam folder now": queue the warm start for each of this
+    user's accounts, even ones already done, instead of waiting for the hourly
+    sweep. The job applies the same rules (setting on, enough spam samples)."""
+    from webmail_plugin_antispam.jobs import bootstrap_account
+
+    accounts = [acc for uid, acc in await _SDK.accounts.live() if uid == user_id]
+    for account_id in accounts:
+        await _SDK.enqueue(
+            bootstrap_account,
+            user_id=str(user_id),
+            account_id=str(account_id),
+            force=True,
+        )
+    return {"queued": len(accounts)}
+
+
 @router.get("/stats", response_model=StatsOut)
 async def stats(user_id: CurrentUserId) -> StatsOut:
     async with _SDK.session(user_id) as s:
diff --git a/plugins/webmail_plugin_antispam/webmail_plugin_antispam/ui/settings.js b/plugins/webmail_plugin_antispam/webmail_plugin_antispam/ui/settings.js
index 29a89f5..db22749 100644
--- a/plugins/webmail_plugin_antispam/webmail_plugin_antispam/ui/settings.js
+++ b/plugins/webmail_plugin_antispam/webmail_plugin_antispam/ui/settings.js
@@ -10,6 +10,7 @@ export default function mount(el, ctx) {
   let rules = [];
   let accounts = [];
   let stats = null;
+  let bootstrapNote = ""; // outcome of the last "learn from my Spam folder now" click
   let disposed = false;
 
   async function load() {
@@ -115,6 +116,8 @@ export default function mount(el, ctx) {
         <label class="wm-row"><input type="checkbox" data-f="network_checks"${settings.network_checks ? " checked" : ""}> Allow online reputation checks</label>
         <p class="wm-faint">Off by default. When on, the filter asks <strong>Spamhaus</strong> whether the sending server or a linked domain is known for spam, and <strong>DNSWL</strong> whether the sender is known-good. That reveals those addresses and domains to them — and to whichever DNS resolver you use. The message itself is never sent, and no fingerprint of it leaves your server.</p>
         <label class="wm-row"><input type="checkbox" data-f="learn_from_provider_junk"${settings.learn_from_provider_junk ? " checked" : ""}> Learn from mail your provider already marked as spam</label>
+        <div class="wm-row"><button class="wm-btn" data-bootstrap${settings.learn_from_provider_junk ? "" : " disabled"}>Learn from my Spam folder now</button><span class="wm-faint" data-bootstrap-note>${esc(bootstrapNote)}</span></div>
+        <p class="wm-faint">Otherwise this runs on its own once an hour, for accounts with at least 10 messages in Spam. Running it again is harmless: messages the filter already learned are skipped.</p>
       </div>
 
       <div class="wm-card"><strong>Activity</strong>${statsBlock()}</div>`;
@@ -133,6 +136,20 @@ export default function mount(el, ctx) {
         patch({ enabled_accounts: ids });
       }),
     );
+    const boot = el.querySelector("[data-bootstrap]");
+    if (boot)
+      boot.addEventListener("click", async () => {
+        boot.disabled = true;
+        try {
+          const res = await ctx.api.pluginFetch("/bootstrap", { method: "POST" });
+          bootstrapNote = res.queued
+            ? "Started — it learns in the background over the next few minutes."
+            : "No account has finished its first import yet.";
+        } catch {
+          bootstrapNote = "Could not start it — try again in a moment.";
+        }
+        render();
+      });
     el.querySelectorAll("[data-add]").forEach((b) =>
       b.addEventListener("click", async () => {
         const kind = b.getAttribute("data-add");