diff --git a/nanobot/channels/signal/runtime.py b/nanobot/channels/signal/runtime.py
index 253f8136e..c3358e44e 100644
--- a/nanobot/channels/signal/runtime.py
+++ b/nanobot/channels/signal/runtime.py
@@ -862,6 +862,7 @@ class SignalChannel(BaseChannel):
                 return False, chat_id
             if (
                 self.config.group.policy == "allowlist"
+                and "*" not in self.config.group.allow_from
                 and chat_id not in self.config.group.allow_from
             ):
                 self.logger.info(
@@ -1061,6 +1062,9 @@ class SignalChannel(BaseChannel):
     def _sender_matches_allowlist(cls, sender_id: str, allow_list: list[str]) -> bool:
         """Return True if any normalized variant of sender_id is on allow_list.
 
+        A ``"*"`` entry allows every sender, matching the channel-wide
+        allowlist contract.
+
         Both ``sender_id`` and each allow_list entry can be a single
         identifier or a pipe-joined composite of several (e.g.
         ``"+1234567890|uuid-abc"``); both sides are split on ``|`` and each
@@ -1070,6 +1074,8 @@ class SignalChannel(BaseChannel):
         """
         if not allow_list:
             return False
+        if "*" in allow_list:
+            return True
         sender_variants: set[str] = set()
         for part in str(sender_id).split("|"):
             sender_variants.update(cls._normalize_signal_id(part))
diff --git a/nanobot/channels/signal/tests/test_signal_channel.py b/nanobot/channels/signal/tests/test_signal_channel.py
index a842d2dbf..ff9ddcacf 100644
--- a/nanobot/channels/signal/tests/test_signal_channel.py
+++ b/nanobot/channels/signal/tests/test_signal_channel.py
@@ -790,6 +790,14 @@ class TestHandleDataMessageDM:
         await ch._handle_receive_notification(params)
         assert len(handled) == 1
 
+    @pytest.mark.asyncio
+    async def test_dm_allowlist_wildcard_preserves_content(self):
+        ch, handled = self._make_dm_channel(policy="allowlist", allow_from=["*"])
+        params = _dm_envelope(source_number="+19995550001", message="wildcard DM")
+        await ch._handle_receive_notification(params)
+        assert len(handled) == 1
+        assert handled[0]["content"] == "wildcard DM"
+
     @pytest.mark.asyncio
     async def test_dm_allowlist_rejected_triggers_pairing(self):
         # Denied DM senders go through super()._handle_message which checks
@@ -1025,6 +1033,16 @@ class TestHandleDataMessageGroup:
         await ch._handle_receive_notification(params)
         assert len(handled) == 1
 
+    @pytest.mark.asyncio
+    async def test_group_allowlist_wildcard_preserves_content(self):
+        ch, handled = self._make_group_channel(
+            policy="allowlist", allow_from=["*"], require_mention=False
+        )
+        params = _group_envelope(group_id="grp==", source_name="Alice", message="wildcard group")
+        await ch._handle_receive_notification(params)
+        assert len(handled) == 1
+        assert "[Alice]: wildcard group" in handled[0]["content"]
+
     @pytest.mark.asyncio
     async def test_group_allowlist_rejected(self):
         ch, handled = self._make_group_channel(policy="allowlist", allow_from=["other=="])