Antispam: online checks no longer switch off Bayes; replies teach ham

- The "online reputation checks" rspamd profile used groups_enabled,
  which means ONLY those groups: with the switch on, a message got the
  RBL lookups alone (1 rule instead of 19, score 0.00) and Bayes never
  ran, so every spam lesson was ignored. It now disables nothing.
- A reply or reply-all teaches the answered message as ham (not
  forwards or new mail, not one's own Sent/Drafts, never over an
  explicit spam mark; once per message). message.sent now carries the
  draft's kind and reply_to_message_id.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

backend/tests/plugins/test_antispam_learning.py

@@ -541,3 +541,50 @@ async def test_done_accounts_are_skipped_unless_forced(monkeypatch: pytest.Monke
     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
+
+
+def _sent(kind: str = "reply", replied: str | None = "m") -> dict[str, Any]:
+    return {
+        "user_id": str(uuid.uuid4()),
+        "kind": kind,
+        "reply_to_message_id": str(uuid.uuid4()) if replied else None,
+    }
+
+
+async def test_a_reply_teaches_ham(wired) -> None:  # type: ignore[no-untyped-def]
+    fake = wired()
+    await hook.on_message_sent(_sent("reply_all"))
+    assert fake.taught == [False]
+    assert fake.recorded == [{"verdict": "ham", "action": "none"}]
+    assert fake.published[0][1]["verdict"] == "ham"
+
+
+@pytest.mark.parametrize("kind", ["forward", "new"])
+async def test_forwards_and_new_mail_teach_nothing(wired, kind) -> None:  # type: ignore[no-untyped-def]
+    fake = wired()
+    await hook.on_message_sent(_sent(kind))
+    assert fake.taught == []
+
+
+@pytest.mark.parametrize("learned", ["ham", "spam"])
+async def test_a_reply_does_not_overrule_or_repeat_a_lesson(wired, learned) -> None:  # type: ignore[no-untyped-def]
+    fake = wired(learned=learned)
+    await hook.on_message_sent(_sent())
+    assert fake.taught == []
+
+
+async def test_a_reply_to_ones_own_message_teaches_nothing(wired) -> None:  # type: ignore[no-untyped-def]
+    fake = wired()
+
+    async def _own(*_a: object, **_k: object) -> dict[str, Any]:
+        return {"account_id": "acc-1", "mailbox_special_use": "sent"}
+
+    fake.messages.envelope = _own
+    await hook.on_message_sent(_sent())
+    assert fake.taught == []
+
+
+async def test_a_reply_while_the_engine_is_down_records_nothing(wired) -> None:  # type: ignore[no-untyped-def]
+    fake = wired(engine_up=False)
+    await hook.on_message_sent(_sent())
+    assert fake.taught == [False] and fake.recorded == []