diff --git a/CHANGELOG.md b/CHANGELOG.md
index b1e6f4e2a20..13f03d5f9a4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,7 @@ Docs: https://docs.openclaw.ai
 ### Fixes
 
 - macOS/Reminders: add the missing `NSRemindersUsageDescription` to the bundled app so `apple-reminders` can trigger the system permission prompt from OpenClaw.app. (#8559) Thanks @dinakars777.
+- iMessage/self-chat echo dedupe: drop reflected duplicate copies only when a matching `is_from_me` event was just seen for the same chat, text, and `created_at`, preventing self-chat loops without broad text-only suppression. Related to #32166. (#38440) Thanks @vincentkoc.
 
 ## 2026.3.11
 
diff --git a/src/imessage/monitor/inbound-processing.test.ts b/src/imessage/monitor/inbound-processing.test.ts
index fab878a4cc7..b18012b9f1f 100644
--- a/src/imessage/monitor/inbound-processing.test.ts
+++ b/src/imessage/monitor/inbound-processing.test.ts
@@ -1,9 +1,11 @@
 import { describe, expect, it, vi } from "vitest";
 import type { OpenClawConfig } from "../../config/config.js";
+import { sanitizeTerminalText } from "../../terminal/safe-text.js";
 import {
   describeIMessageEchoDropLog,
   resolveIMessageInboundDecision,
 } from "./inbound-processing.js";
+import { createSelfChatCache } from "./self-chat-cache.js";
 
 describe("resolveIMessageInboundDecision echo detection", () => {
   const cfg = {} as OpenClawConfig;
@@ -46,6 +48,324 @@ describe("resolveIMessageInboundDecision echo detection", () => {
       }),
     );
   });
+
+  it("drops reflected self-chat duplicates after seeing the from-me copy", () => {
+    const selfChatCache = createSelfChatCache();
+    const createdAt = "2026-03-02T20:58:10.649Z";
+
+    expect(
+      resolveIMessageInboundDecision({
+        cfg,
+        accountId: "default",
+        message: {
+          id: 9641,
+          sender: "+15555550123",
+          text: "Do you want to report this issue?",
+          created_at: createdAt,
+          is_from_me: true,
+          is_group: false,
+        },
+        opts: undefined,
+        messageText: "Do you want to report this issue?",
+        bodyText: "Do you want to report this issue?",
+        allowFrom: [],
+        groupAllowFrom: [],
+        groupPolicy: "open",
+        dmPolicy: "open",
+        storeAllowFrom: [],
+        historyLimit: 0,
+        groupHistories: new Map(),
+        echoCache: undefined,
+        selfChatCache,
+        logVerbose: undefined,
+      }),
+    ).toEqual({ kind: "drop", reason: "from me" });
+
+    expect(
+      resolveIMessageInboundDecision({
+        cfg,
+        accountId: "default",
+        message: {
+          id: 9642,
+          sender: "+15555550123",
+          text: "Do you want to report this issue?",
+          created_at: createdAt,
+          is_from_me: false,
+          is_group: false,
+        },
+        opts: undefined,
+        messageText: "Do you want to report this issue?",
+        bodyText: "Do you want to report this issue?",
+        allowFrom: [],
+        groupAllowFrom: [],
+        groupPolicy: "open",
+        dmPolicy: "open",
+        storeAllowFrom: [],
+        historyLimit: 0,
+        groupHistories: new Map(),
+        echoCache: undefined,
+        selfChatCache,
+        logVerbose: undefined,
+      }),
+    ).toEqual({ kind: "drop", reason: "self-chat echo" });
+  });
+
+  it("does not drop same-text messages when created_at differs", () => {
+    const selfChatCache = createSelfChatCache();
+
+    resolveIMessageInboundDecision({
+      cfg,
+      accountId: "default",
+      message: {
+        id: 9641,
+        sender: "+15555550123",
+        text: "ok",
+        created_at: "2026-03-02T20:58:10.649Z",
+        is_from_me: true,
+        is_group: false,
+      },
+      opts: undefined,
+      messageText: "ok",
+      bodyText: "ok",
+      allowFrom: [],
+      groupAllowFrom: [],
+      groupPolicy: "open",
+      dmPolicy: "open",
+      storeAllowFrom: [],
+      historyLimit: 0,
+      groupHistories: new Map(),
+      echoCache: undefined,
+      selfChatCache,
+      logVerbose: undefined,
+    });
+
+    const decision = resolveIMessageInboundDecision({
+      cfg,
+      accountId: "default",
+      message: {
+        id: 9642,
+        sender: "+15555550123",
+        text: "ok",
+        created_at: "2026-03-02T20:58:11.649Z",
+        is_from_me: false,
+        is_group: false,
+      },
+      opts: undefined,
+      messageText: "ok",
+      bodyText: "ok",
+      allowFrom: [],
+      groupAllowFrom: [],
+      groupPolicy: "open",
+      dmPolicy: "open",
+      storeAllowFrom: [],
+      historyLimit: 0,
+      groupHistories: new Map(),
+      echoCache: undefined,
+      selfChatCache,
+      logVerbose: undefined,
+    });
+
+    expect(decision.kind).toBe("dispatch");
+  });
+
+  it("keeps self-chat cache scoped to configured group threads", () => {
+    const selfChatCache = createSelfChatCache();
+    const groupedCfg = {
+      channels: {
+        imessage: {
+          groups: {
+            "123": {},
+            "456": {},
+          },
+        },
+      },
+    } as OpenClawConfig;
+    const createdAt = "2026-03-02T20:58:10.649Z";
+
+    expect(
+      resolveIMessageInboundDecision({
+        cfg: groupedCfg,
+        accountId: "default",
+        message: {
+          id: 9701,
+          chat_id: 123,
+          sender: "+15555550123",
+          text: "same text",
+          created_at: createdAt,
+          is_from_me: true,
+          is_group: false,
+        },
+        opts: undefined,
+        messageText: "same text",
+        bodyText: "same text",
+        allowFrom: [],
+        groupAllowFrom: [],
+        groupPolicy: "open",
+        dmPolicy: "open",
+        storeAllowFrom: [],
+        historyLimit: 0,
+        groupHistories: new Map(),
+        echoCache: undefined,
+        selfChatCache,
+        logVerbose: undefined,
+      }),
+    ).toEqual({ kind: "drop", reason: "from me" });
+
+    const decision = resolveIMessageInboundDecision({
+      cfg: groupedCfg,
+      accountId: "default",
+      message: {
+        id: 9702,
+        chat_id: 456,
+        sender: "+15555550123",
+        text: "same text",
+        created_at: createdAt,
+        is_from_me: false,
+        is_group: false,
+      },
+      opts: undefined,
+      messageText: "same text",
+      bodyText: "same text",
+      allowFrom: [],
+      groupAllowFrom: [],
+      groupPolicy: "open",
+      dmPolicy: "open",
+      storeAllowFrom: [],
+      historyLimit: 0,
+      groupHistories: new Map(),
+      echoCache: undefined,
+      selfChatCache,
+      logVerbose: undefined,
+    });
+
+    expect(decision.kind).toBe("dispatch");
+  });
+
+  it("does not drop other participants in the same group thread", () => {
+    const selfChatCache = createSelfChatCache();
+    const createdAt = "2026-03-02T20:58:10.649Z";
+
+    expect(
+      resolveIMessageInboundDecision({
+        cfg,
+        accountId: "default",
+        message: {
+          id: 9751,
+          chat_id: 123,
+          sender: "+15555550123",
+          text: "same text",
+          created_at: createdAt,
+          is_from_me: true,
+          is_group: true,
+        },
+        opts: undefined,
+        messageText: "same text",
+        bodyText: "same text",
+        allowFrom: [],
+        groupAllowFrom: [],
+        groupPolicy: "open",
+        dmPolicy: "open",
+        storeAllowFrom: [],
+        historyLimit: 0,
+        groupHistories: new Map(),
+        echoCache: undefined,
+        selfChatCache,
+        logVerbose: undefined,
+      }),
+    ).toEqual({ kind: "drop", reason: "from me" });
+
+    const decision = resolveIMessageInboundDecision({
+      cfg,
+      accountId: "default",
+      message: {
+        id: 9752,
+        chat_id: 123,
+        sender: "+15555550999",
+        text: "same text",
+        created_at: createdAt,
+        is_from_me: false,
+        is_group: true,
+      },
+      opts: undefined,
+      messageText: "same text",
+      bodyText: "same text",
+      allowFrom: [],
+      groupAllowFrom: [],
+      groupPolicy: "open",
+      dmPolicy: "open",
+      storeAllowFrom: [],
+      historyLimit: 0,
+      groupHistories: new Map(),
+      echoCache: undefined,
+      selfChatCache,
+      logVerbose: undefined,
+    });
+
+    expect(decision.kind).toBe("dispatch");
+  });
+
+  it("sanitizes reflected duplicate previews before logging", () => {
+    const selfChatCache = createSelfChatCache();
+    const logVerbose = vi.fn();
+    const createdAt = "2026-03-02T20:58:10.649Z";
+    const bodyText = "line-1\nline-2\t\u001b[31mred";
+
+    resolveIMessageInboundDecision({
+      cfg,
+      accountId: "default",
+      message: {
+        id: 9801,
+        sender: "+15555550123",
+        text: bodyText,
+        created_at: createdAt,
+        is_from_me: true,
+        is_group: false,
+      },
+      opts: undefined,
+      messageText: bodyText,
+      bodyText,
+      allowFrom: [],
+      groupAllowFrom: [],
+      groupPolicy: "open",
+      dmPolicy: "open",
+      storeAllowFrom: [],
+      historyLimit: 0,
+      groupHistories: new Map(),
+      echoCache: undefined,
+      selfChatCache,
+      logVerbose,
+    });
+
+    resolveIMessageInboundDecision({
+      cfg,
+      accountId: "default",
+      message: {
+        id: 9802,
+        sender: "+15555550123",
+        text: bodyText,
+        created_at: createdAt,
+        is_from_me: false,
+        is_group: false,
+      },
+      opts: undefined,
+      messageText: bodyText,
+      bodyText,
+      allowFrom: [],
+      groupAllowFrom: [],
+      groupPolicy: "open",
+      dmPolicy: "open",
+      storeAllowFrom: [],
+      historyLimit: 0,
+      groupHistories: new Map(),
+      echoCache: undefined,
+      selfChatCache,
+      logVerbose,
+    });
+
+    expect(logVerbose).toHaveBeenCalledWith(
+      `imessage: dropping self-chat reflected duplicate: "${sanitizeTerminalText(bodyText)}"`,
+    );
+  });
 });
 
 describe("describeIMessageEchoDropLog", () => {
diff --git a/src/imessage/monitor/inbound-processing.ts b/src/imessage/monitor/inbound-processing.ts
index d042f1f1a0f..b3fc10c1e7b 100644
--- a/src/imessage/monitor/inbound-processing.ts
+++ b/src/imessage/monitor/inbound-processing.ts
@@ -24,6 +24,7 @@ import {
   DM_GROUP_ACCESS_REASON,
   resolveDmGroupAccessWithLists,
 } from "../../security/dm-policy-shared.js";
+import { sanitizeTerminalText } from "../../terminal/safe-text.js";
 import { truncateUtf16Safe } from "../../utils.js";
 import {
   formatIMessageChatTarget,
@@ -31,6 +32,7 @@ import {
   normalizeIMessageHandle,
 } from "../targets.js";
 import { detectReflectedContent } from "./reflection-guard.js";
+import type { SelfChatCache } from "./self-chat-cache.js";
 import type { MonitorIMessageOpts, IMessagePayload } from "./types.js";
 
 type IMessageReplyContext = {
@@ -101,6 +103,7 @@ export function resolveIMessageInboundDecision(params: {
   historyLimit: number;
   groupHistories: Map<string, HistoryEntry[]>;
   echoCache?: { has: (scope: string, lookup: { text?: string; messageId?: string }) => boolean };
+  selfChatCache?: SelfChatCache;
   logVerbose?: (msg: string) => void;
 }): IMessageInboundDecision {
   const senderRaw = params.message.sender ?? "";
@@ -109,13 +112,10 @@ export function resolveIMessageInboundDecision(params: {
     return { kind: "drop", reason: "missing sender" };
   }
   const senderNormalized = normalizeIMessageHandle(sender);
-  if (params.message.is_from_me) {
-    return { kind: "drop", reason: "from me" };
-  }
-
   const chatId = params.message.chat_id ?? undefined;
   const chatGuid = params.message.chat_guid ?? undefined;
   const chatIdentifier = params.message.chat_identifier ?? undefined;
+  const createdAt = params.message.created_at ? Date.parse(params.message.created_at) : undefined;
 
   const groupIdCandidate = chatId !== undefined ? String(chatId) : undefined;
   const groupListPolicy = groupIdCandidate
@@ -138,6 +138,18 @@ export function resolveIMessageInboundDecision(params: {
     groupIdCandidate && groupListPolicy.allowlistEnabled && groupListPolicy.groupConfig,
   );
   const isGroup = Boolean(params.message.is_group) || treatAsGroupByConfig;
+  const selfChatLookup = {
+    accountId: params.accountId,
+    isGroup,
+    chatId,
+    sender,
+    text: params.bodyText,
+    createdAt,
+  };
+  if (params.message.is_from_me) {
+    params.selfChatCache?.remember(selfChatLookup);
+    return { kind: "drop", reason: "from me" };
+  }
   if (isGroup && !chatId) {
     return { kind: "drop", reason: "group without chat_id" };
   }
@@ -215,6 +227,17 @@ export function resolveIMessageInboundDecision(params: {
     return { kind: "drop", reason: "empty body" };
   }
 
+  if (
+    params.selfChatCache?.has({
+      ...selfChatLookup,
+      text: bodyText,
+    })
+  ) {
+    const preview = sanitizeTerminalText(truncateUtf16Safe(bodyText, 50));
+    params.logVerbose?.(`imessage: dropping self-chat reflected duplicate: "${preview}"`);
+    return { kind: "drop", reason: "self-chat echo" };
+  }
+
   // Echo detection: check if the received message matches a recently sent message.
   // Scope by conversation so same text in different chats is not conflated.
   const inboundMessageId = params.message.id != null ? String(params.message.id) : undefined;
@@ -250,7 +273,6 @@ export function resolveIMessageInboundDecision(params: {
   }
 
   const replyContext = describeReplyContext(params.message);
-  const createdAt = params.message.created_at ? Date.parse(params.message.created_at) : undefined;
   const historyKey = isGroup
     ? String(chatId ?? chatGuid ?? chatIdentifier ?? "unknown")
     : undefined;
diff --git a/src/imessage/monitor/monitor-provider.ts b/src/imessage/monitor/monitor-provider.ts
index 1ea35b60d95..1324529cbff 100644
--- a/src/imessage/monitor/monitor-provider.ts
+++ b/src/imessage/monitor/monitor-provider.ts
@@ -53,6 +53,7 @@ import {
 import { createLoopRateLimiter } from "./loop-rate-limiter.js";
 import { parseIMessageNotification } from "./parse-notification.js";
 import { normalizeAllowList, resolveRuntime } from "./runtime.js";
+import { createSelfChatCache } from "./self-chat-cache.js";
 import type { IMessagePayload, MonitorIMessageOpts } from "./types.js";
 
 /**
@@ -99,6 +100,7 @@ export async function monitorIMessageProvider(opts: MonitorIMessageOpts = {}): P
   );
   const groupHistories = new Map<string, HistoryEntry[]>();
   const sentMessageCache = createSentMessageCache();
+  const selfChatCache = createSelfChatCache();
   const loopRateLimiter = createLoopRateLimiter();
   const textLimit = resolveTextChunkLimit(cfg, "imessage", accountInfo.accountId);
   const allowFrom = normalizeAllowList(opts.allowFrom ?? imessageCfg.allowFrom);
@@ -252,6 +254,7 @@ export async function monitorIMessageProvider(opts: MonitorIMessageOpts = {}): P
       historyLimit,
       groupHistories,
       echoCache: sentMessageCache,
+      selfChatCache,
       logVerbose,
     });
 
@@ -267,6 +270,7 @@ export async function monitorIMessageProvider(opts: MonitorIMessageOpts = {}): P
       // are normal and should not escalate.
       const isLoopDrop =
         decision.reason === "echo" ||
+        decision.reason === "self-chat echo" ||
         decision.reason === "reflected assistant content" ||
         decision.reason === "from me";
       if (isLoopDrop) {
diff --git a/src/imessage/monitor/self-chat-cache.test.ts b/src/imessage/monitor/self-chat-cache.test.ts
new file mode 100644
index 00000000000..cf3a245ba30
--- /dev/null
+++ b/src/imessage/monitor/self-chat-cache.test.ts
@@ -0,0 +1,76 @@
+import { describe, expect, it, vi } from "vitest";
+import { createSelfChatCache } from "./self-chat-cache.js";
+
+describe("createSelfChatCache", () => {
+  const directLookup = {
+    accountId: "default",
+    sender: "+15555550123",
+    isGroup: false,
+  } as const;
+
+  it("matches repeated lookups for the same scope, timestamp, and text", () => {
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date("2026-03-07T00:00:00Z"));
+
+    const cache = createSelfChatCache();
+    cache.remember({
+      ...directLookup,
+      text: "  hello\r\nworld  ",
+      createdAt: 123,
+    });
+
+    expect(
+      cache.has({
+        ...directLookup,
+        text: "hello\nworld",
+        createdAt: 123,
+      }),
+    ).toBe(true);
+  });
+
+  it("expires entries after the ttl window", () => {
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date("2026-03-07T00:00:00Z"));
+
+    const cache = createSelfChatCache();
+    cache.remember({ ...directLookup, text: "hello", createdAt: 123 });
+
+    vi.advanceTimersByTime(11_001);
+
+    expect(cache.has({ ...directLookup, text: "hello", createdAt: 123 })).toBe(false);
+  });
+
+  it("evicts older entries when the cache exceeds its cap", () => {
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date("2026-03-07T00:00:00Z"));
+
+    const cache = createSelfChatCache();
+    for (let i = 0; i < 513; i += 1) {
+      cache.remember({
+        ...directLookup,
+        text: `message-${i}`,
+        createdAt: i,
+      });
+      vi.advanceTimersByTime(1_001);
+    }
+
+    expect(cache.has({ ...directLookup, text: "message-0", createdAt: 0 })).toBe(false);
+    expect(cache.has({ ...directLookup, text: "message-512", createdAt: 512 })).toBe(true);
+  });
+
+  it("does not collide long texts that differ only in the middle", () => {
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date("2026-03-07T00:00:00Z"));
+
+    const cache = createSelfChatCache();
+    const prefix = "a".repeat(256);
+    const suffix = "b".repeat(256);
+    const longTextA = `${prefix}${"x".repeat(300)}${suffix}`;
+    const longTextB = `${prefix}${"y".repeat(300)}${suffix}`;
+
+    cache.remember({ ...directLookup, text: longTextA, createdAt: 123 });
+
+    expect(cache.has({ ...directLookup, text: longTextA, createdAt: 123 })).toBe(true);
+    expect(cache.has({ ...directLookup, text: longTextB, createdAt: 123 })).toBe(false);
+  });
+});
diff --git a/src/imessage/monitor/self-chat-cache.ts b/src/imessage/monitor/self-chat-cache.ts
new file mode 100644
index 00000000000..a2c4c31ccd9
--- /dev/null
+++ b/src/imessage/monitor/self-chat-cache.ts
@@ -0,0 +1,103 @@
+import { createHash } from "node:crypto";
+import { formatIMessageChatTarget } from "../targets.js";
+
+type SelfChatCacheKeyParts = {
+  accountId: string;
+  sender: string;
+  isGroup: boolean;
+  chatId?: number;
+};
+
+export type SelfChatLookup = SelfChatCacheKeyParts & {
+  text?: string;
+  createdAt?: number;
+};
+
+export type SelfChatCache = {
+  remember: (lookup: SelfChatLookup) => void;
+  has: (lookup: SelfChatLookup) => boolean;
+};
+
+const SELF_CHAT_TTL_MS = 10_000;
+const MAX_SELF_CHAT_CACHE_ENTRIES = 512;
+const CLEANUP_MIN_INTERVAL_MS = 1_000;
+
+function normalizeText(text: string | undefined): string | null {
+  if (!text) {
+    return null;
+  }
+  const normalized = text.replace(/\r\n?/g, "\n").trim();
+  return normalized ? normalized : null;
+}
+
+function isUsableTimestamp(createdAt: number | undefined): createdAt is number {
+  return typeof createdAt === "number" && Number.isFinite(createdAt);
+}
+
+function digestText(text: string): string {
+  return createHash("sha256").update(text).digest("hex");
+}
+
+function buildScope(parts: SelfChatCacheKeyParts): string {
+  if (!parts.isGroup) {
+    return `${parts.accountId}:imessage:${parts.sender}`;
+  }
+  const chatTarget = formatIMessageChatTarget(parts.chatId) || "chat_id:unknown";
+  return `${parts.accountId}:${chatTarget}:imessage:${parts.sender}`;
+}
+
+class DefaultSelfChatCache implements SelfChatCache {
+  private cache = new Map<string, number>();
+  private lastCleanupAt = 0;
+
+  private buildKey(lookup: SelfChatLookup): string | null {
+    const text = normalizeText(lookup.text);
+    if (!text || !isUsableTimestamp(lookup.createdAt)) {
+      return null;
+    }
+    return `${buildScope(lookup)}:${lookup.createdAt}:${digestText(text)}`;
+  }
+
+  remember(lookup: SelfChatLookup): void {
+    const key = this.buildKey(lookup);
+    if (!key) {
+      return;
+    }
+    this.cache.set(key, Date.now());
+    this.maybeCleanup();
+  }
+
+  has(lookup: SelfChatLookup): boolean {
+    this.maybeCleanup();
+    const key = this.buildKey(lookup);
+    if (!key) {
+      return false;
+    }
+    const timestamp = this.cache.get(key);
+    return typeof timestamp === "number" && Date.now() - timestamp <= SELF_CHAT_TTL_MS;
+  }
+
+  private maybeCleanup(): void {
+    const now = Date.now();
+    if (now - this.lastCleanupAt < CLEANUP_MIN_INTERVAL_MS) {
+      return;
+    }
+    this.lastCleanupAt = now;
+    for (const [key, timestamp] of this.cache.entries()) {
+      if (now - timestamp > SELF_CHAT_TTL_MS) {
+        this.cache.delete(key);
+      }
+    }
+    while (this.cache.size > MAX_SELF_CHAT_CACHE_ENTRIES) {
+      const oldestKey = this.cache.keys().next().value;
+      if (typeof oldestKey !== "string") {
+        break;
+      }
+      this.cache.delete(oldestKey);
+    }
+  }
+}
+
+export function createSelfChatCache(): SelfChatCache {
+  return new DefaultSelfChatCache();
+}