diff --git a/extensions/msteams/src/monitor-handler/message-handler.authz.test.ts b/extensions/msteams/src/monitor-handler/message-handler.authz.test.ts
index 6d1a95817c91..6cf86a10d017 100644
--- a/extensions/msteams/src/monitor-handler/message-handler.authz.test.ts
+++ b/extensions/msteams/src/monitor-handler/message-handler.authz.test.ts
@@ -606,6 +606,98 @@ describe("msteams monitor handler authz", () => {
     expect(runtimeApiMockState.dispatchReplyFromConfigWithSettledDispatcher).not.toHaveBeenCalled();
   });
 
+  it("marks skipped channel message system events as non-owner", async () => {
+    resetThreadMocks();
+    const { deps, enqueueSystemEvent } = createDeps({
+      channels: {
+        msteams: {
+          groupPolicy: "open",
+          requireMention: true,
+        },
+      },
+    } as OpenClawConfig);
+
+    const handler = createMSTeamsMessageHandler(deps);
+    await handler(
+      createMessageActivity({
+        id: "msg-skip-mention",
+        text: "please run the deployment",
+        from: {
+          id: "member-id",
+          aadObjectId: "member-aad",
+          name: "Member",
+        },
+        conversation: {
+          id: "19:channel@thread.tacv2",
+          conversationType: "channel",
+        },
+        channelData: {
+          team: { id: "team123", name: "Team 123" },
+          channel: { name: "General" },
+        },
+      }),
+    );
+
+    expect(runtimeApiMockState.dispatchReplyFromConfigWithSettledDispatcher).not.toHaveBeenCalled();
+    const systemEventCall = enqueueSystemEvent.mock.calls.find(
+      ([text]) => typeof text === "string" && text.includes("please run the deployment"),
+    );
+    if (!systemEventCall) {
+      throw new Error("expected skipped Teams message system event");
+    }
+    expect(systemEventCall[1]).toMatchObject({
+      forceSenderIsOwnerFalse: true,
+      trusted: false,
+    });
+  });
+
+  it("keeps dispatched primary message system events owner-neutral", async () => {
+    resetThreadMocks();
+    const { deps, enqueueSystemEvent } = createDeps({
+      channels: {
+        msteams: {
+          groupPolicy: "open",
+          requireMention: false,
+        },
+      },
+    } as OpenClawConfig);
+
+    const handler = createMSTeamsMessageHandler(deps);
+    await handler(
+      createMessageActivity({
+        id: "msg-active",
+        text: "please check the build",
+        from: {
+          id: "member-id",
+          aadObjectId: "member-aad",
+          name: "Member",
+        },
+        conversation: {
+          id: "19:channel@thread.tacv2",
+          conversationType: "channel",
+        },
+        channelData: {
+          team: { id: "team123", name: "Team 123" },
+          channel: { name: "General" },
+        },
+      }),
+    );
+
+    expect(runtimeApiMockState.dispatchReplyFromConfigWithSettledDispatcher).toHaveBeenCalled();
+    const systemEventCall = enqueueSystemEvent.mock.calls.find(
+      ([text]) => typeof text === "string" && text.includes("please check the build"),
+    );
+    if (!systemEventCall) {
+      throw new Error("expected active Teams message system event");
+    }
+    expect(systemEventCall[1]).not.toMatchObject({
+      forceSenderIsOwnerFalse: true,
+    });
+    expect(systemEventCall[1]).not.toMatchObject({
+      trusted: false,
+    });
+  });
+
   it("authorizes text control commands from static access groups", async () => {
     resetThreadMocks();
     const hasControlCommand = vi.fn(() => true);
diff --git a/extensions/msteams/src/monitor-handler/message-handler.thread-parent.test.ts b/extensions/msteams/src/monitor-handler/message-handler.thread-parent.test.ts
index 23398c80ecc6..61f5b6d5ead4 100644
--- a/extensions/msteams/src/monitor-handler/message-handler.thread-parent.test.ts
+++ b/extensions/msteams/src/monitor-handler/message-handler.thread-parent.test.ts
@@ -38,11 +38,20 @@ vi.mock("../graph-thread.js", () => {
 
 describe("msteams thread parent context injection", () => {
   type MessageHandler = ReturnType<typeof createMSTeamsMessageHandler>;
+  type ParentSystemEventCall = [
+    string,
+    {
+      sessionKey: string;
+      contextKey?: string;
+      forceSenderIsOwnerFalse?: boolean;
+      trusted?: boolean;
+    },
+  ];
 
   function findParentSystemEventCall(
     mock: ReturnType<typeof vi.fn>,
-  ): [string, { sessionKey: string; contextKey?: string }] | undefined {
-    const calls = mock.mock.calls as Array<[string, { sessionKey: string; contextKey?: string }]>;
+  ): ParentSystemEventCall | undefined {
+    const calls = mock.mock.calls as ParentSystemEventCall[];
     return calls.find(([text]) => text.startsWith("Replying to @"));
   }
 
@@ -93,6 +102,10 @@ describe("msteams thread parent context injection", () => {
     expect(parentCall[0]).toBe("Replying to @Alice: Can someone investigate the latency spike?");
     expect(parentCall[1]?.contextKey).toContain("msteams:thread-parent:");
     expect(parentCall[1]?.contextKey).toContain("thread-root-123");
+    expect(parentCall[1]).toMatchObject({
+      forceSenderIsOwnerFalse: true,
+      trusted: false,
+    });
   });
 
   it("caches parent fetches across thread replies in the same session", async () => {
diff --git a/extensions/msteams/src/monitor-handler/message-handler.ts b/extensions/msteams/src/monitor-handler/message-handler.ts
index 60660ec91e4f..28e0193f1e2d 100644
--- a/extensions/msteams/src/monitor-handler/message-handler.ts
+++ b/extensions/msteams/src/monitor-handler/message-handler.ts
@@ -498,10 +498,15 @@ export function createMSTeamsMessageHandler(deps: MSTeamsMessageHandlerDeps) {
       ? `Teams DM from ${senderName}`
       : `Teams message in ${conversationType} from ${senderName}`;
 
-    core.system.enqueueSystemEvent(`${inboundLabel}: ${preview}`, {
-      sessionKey: route.sessionKey,
-      contextKey: `msteams:message:${conversationId}:${activity.id ?? "unknown"}`,
-    });
+    const enqueuePrimaryMessageSystemEvent = (opts?: {
+      forceSenderIsOwnerFalse?: boolean;
+      trusted?: boolean;
+    }) =>
+      core.system.enqueueSystemEvent(`${inboundLabel}: ${preview}`, {
+        sessionKey: route.sessionKey,
+        contextKey: `msteams:message:${conversationId}:${activity.id ?? "unknown"}`,
+        ...opts,
+      });
 
     const channelId = conversationId;
     const { teamConfig, channelConfig } = channelGate;
@@ -536,6 +541,10 @@ export function createMSTeamsMessageHandler(deps: MSTeamsMessageHandlerDeps) {
           requireMention,
           mentioned,
         });
+        enqueuePrimaryMessageSystemEvent({
+          forceSenderIsOwnerFalse: true,
+          trusted: false,
+        });
         createChannelHistoryWindow({ historyMap: conversationHistories }).record({
           historyKey: conversationId,
           limit: historyLimit,
@@ -549,6 +558,7 @@ export function createMSTeamsMessageHandler(deps: MSTeamsMessageHandlerDeps) {
         return;
       }
     }
+    enqueuePrimaryMessageSystemEvent();
     let graphConversationId = translateMSTeamsDmConversationIdForGraph({
       isDirectMessage,
       conversationId,
@@ -665,6 +675,8 @@ export function createMSTeamsMessageHandler(deps: MSTeamsMessageHandlerDeps) {
           core.system.enqueueSystemEvent(formatParentContextEvent(parentSummary), {
             sessionKey: route.sessionKey,
             contextKey: `msteams:thread-parent:${conversationId}:${activity.replyToId}`,
+            forceSenderIsOwnerFalse: true,
+            trusted: false,
           });
           markParentContextInjected(route.sessionKey, activity.replyToId);
         }
diff --git a/extensions/msteams/src/monitor-handler/reaction-handler.test.ts b/extensions/msteams/src/monitor-handler/reaction-handler.test.ts
index 39700ed42abb..33dec61e2de3 100644
--- a/extensions/msteams/src/monitor-handler/reaction-handler.test.ts
+++ b/extensions/msteams/src/monitor-handler/reaction-handler.test.ts
@@ -207,6 +207,8 @@ describe("createMSTeamsReactionHandler", () => {
       expect(label).toContain("added");
       expect(meta.sessionKey).toBe("test-session");
       expect(meta.contextKey).toContain("added");
+      expect(meta.forceSenderIsOwnerFalse).toBe(true);
+      expect(meta.trusted).toBe(false);
     });
 
     it("enqueues system event for reactionsRemoved", async () => {
diff --git a/extensions/msteams/src/monitor-handler/reaction-handler.ts b/extensions/msteams/src/monitor-handler/reaction-handler.ts
index 2490c89149cc..dfcefc64affd 100644
--- a/extensions/msteams/src/monitor-handler/reaction-handler.ts
+++ b/extensions/msteams/src/monitor-handler/reaction-handler.ts
@@ -116,6 +116,8 @@ export function createMSTeamsReactionHandler(deps: MSTeamsMessageHandlerDeps) {
       core.system.enqueueSystemEvent(label, {
         sessionKey: route.sessionKey,
         contextKey: `msteams:reaction:${conversationId}:${targetMessageId}:${senderId}:${reactionType}:${direction}`,
+        forceSenderIsOwnerFalse: true,
+        trusted: false,
       });
     }
   };