diff --git a/cron/scheduler.py b/cron/scheduler.py
index 21c91bcdee..d527a22601 100644
--- a/cron/scheduler.py
+++ b/cron/scheduler.py
@@ -49,6 +49,22 @@ _KNOWN_DELIVERY_PLATFORMS = frozenset({
     "qqbot",
 })
 
+# Platforms that support a configured cron/notification home target, mapped to
+# the environment variable used by gateway setup/runtime config.
+_HOME_TARGET_ENV_VARS = {
+    "matrix": "MATRIX_HOME_ROOM",
+    "telegram": "TELEGRAM_HOME_CHANNEL",
+    "discord": "DISCORD_HOME_CHANNEL",
+    "slack": "SLACK_HOME_CHANNEL",
+    "signal": "SIGNAL_HOME_CHANNEL",
+    "mattermost": "MATTERMOST_HOME_CHANNEL",
+    "sms": "SMS_HOME_CHANNEL",
+    "feishu": "FEISHU_HOME_CHANNEL",
+    "wecom": "WECOM_HOME_CHANNEL",
+    "weixin": "WEIXIN_HOME_CHANNEL",
+    "bluebubbles": "BLUEBUBBLES_HOME_CHANNEL",
+}
+
 from cron.jobs import get_due_jobs, mark_job_run, save_job_output, advance_next_run
 
 # Sentinel: when a cron agent has nothing new to report, it can start its
@@ -76,8 +92,17 @@ def _resolve_origin(job: dict) -> Optional[dict]:
     return None
 
 
+def _get_home_target_chat_id(platform_name: str) -> str:
+    """Return the configured home target chat/room ID for a delivery platform."""
+    env_var = _HOME_TARGET_ENV_VARS.get(platform_name.lower())
+    if not env_var:
+        return ""
+    return os.getenv(env_var, "")
+
+
 def _resolve_single_delivery_target(job: dict, deliver_value: str) -> Optional[dict]:
     """Resolve one concrete auto-delivery target for a cron job."""
+
     origin = _resolve_origin(job)
 
     if deliver_value == "local":
@@ -92,8 +117,8 @@ def _resolve_single_delivery_target(job: dict, deliver_value: str) -> Optional[d
             }
         # Origin missing (e.g. job created via API/script) — try each
         # platform's home channel as a fallback instead of silently dropping.
-        for platform_name in ("matrix", "telegram", "discord", "slack", "feishu", "wecom", "weixin", "bluebubbles"):
-            chat_id = os.getenv(f"{platform_name.upper()}_HOME_CHANNEL", "")
+        for platform_name in _HOME_TARGET_ENV_VARS:
+            chat_id = _get_home_target_chat_id(platform_name)
             if chat_id:
                 logger.info(
                     "Job '%s' has deliver=origin but no origin; falling back to %s home channel",
@@ -148,7 +173,7 @@ def _resolve_single_delivery_target(job: dict, deliver_value: str) -> Optional[d
 
     if platform_name.lower() not in _KNOWN_DELIVERY_PLATFORMS:
         return None
-    chat_id = os.getenv(f"{platform_name.upper()}_HOME_CHANNEL", "")
+    chat_id = _get_home_target_chat_id(platform_name)
     if not chat_id:
         return None
 
diff --git a/tests/cron/test_scheduler.py b/tests/cron/test_scheduler.py
index da141edbf6..0877564fe6 100644
--- a/tests/cron/test_scheduler.py
+++ b/tests/cron/test_scheduler.py
@@ -67,6 +67,10 @@ class TestResolveDeliveryTarget:
     @pytest.mark.parametrize(
         ("platform", "env_var", "chat_id"),
         [
+            ("matrix", "MATRIX_HOME_ROOM", "!bot-room:example.org"),
+            ("signal", "SIGNAL_HOME_CHANNEL", "+15551234567"),
+            ("mattermost", "MATTERMOST_HOME_CHANNEL", "team-town-square"),
+            ("sms", "SMS_HOME_CHANNEL", "+15557654321"),
             ("feishu", "FEISHU_HOME_CHANNEL", "oc_home"),
             ("wecom", "WECOM_HOME_CHANNEL", "wecom-home"),
             ("weixin", "WEIXIN_HOME_CHANNEL", "wxid_home"),
@@ -76,10 +80,14 @@ class TestResolveDeliveryTarget:
         self, monkeypatch, platform, env_var, chat_id
     ):
         for fallback_env in (
+            "MATRIX_HOME_ROOM",
             "MATRIX_HOME_CHANNEL",
             "TELEGRAM_HOME_CHANNEL",
             "DISCORD_HOME_CHANNEL",
             "SLACK_HOME_CHANNEL",
+            "SIGNAL_HOME_CHANNEL",
+            "MATTERMOST_HOME_CHANNEL",
+            "SMS_HOME_CHANNEL",
             "BLUEBUBBLES_HOME_CHANNEL",
             "FEISHU_HOME_CHANNEL",
             "WECOM_HOME_CHANNEL",
@@ -94,6 +102,16 @@ class TestResolveDeliveryTarget:
             "thread_id": None,
         }
 
+    def test_bare_matrix_delivery_uses_matrix_home_room(self, monkeypatch):
+        monkeypatch.delenv("MATRIX_HOME_CHANNEL", raising=False)
+        monkeypatch.setenv("MATRIX_HOME_ROOM", "!room123:example.org")
+
+        assert _resolve_delivery_target({"deliver": "matrix"}) == {
+            "platform": "matrix",
+            "chat_id": "!room123:example.org",
+            "thread_id": None,
+        }
+
     def test_explicit_telegram_topic_target_with_thread_id(self):
         """deliver: 'telegram:chat_id:thread_id' parses correctly."""
         job = {