diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5bb8c43cd..259af2bca 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -36,6 +36,7 @@
 - Telegram: allow reply-chain messages to bypass mention gating in groups. (#1038) — thanks @adityashaw2.
 - Messages: refresh live directory cache results when resolving targets.
 - Messages: mirror delivered outbound text/media into session transcripts. (#1031) — thanks @TSavo.
+- Messages: avoid redundant sender envelopes for iMessage + Signal group chats. (#1080) — thanks @tyler6204.
 - Cron: isolated cron jobs now start a fresh session id on every run to prevent context buildup.
 - Docs: add `/help` hub, Node/npm PATH guide, and expand directory CLI docs.
 - Config: support env var substitution in config values. (#1044) — thanks @sebslight.
diff --git a/src/auto-reply/reply/inbound-sender-meta.ts b/src/auto-reply/reply/inbound-sender-meta.ts
index 1417cb767..d60b61e75 100644
--- a/src/auto-reply/reply/inbound-sender-meta.ts
+++ b/src/auto-reply/reply/inbound-sender-meta.ts
@@ -33,7 +33,8 @@ function hasSenderMetaLine(body: string, ctx: MsgContext): boolean {
   if (candidates.length === 0) return false;
   return candidates.some((candidate) => {
     const escaped = escapeRegExp(candidate);
-    // Check for sender at start of line OR after envelope header bracket
+    // Envelope bodies look like "[Signal ...] Alice: hi".
+    // Treat the post-header sender prefix as already having sender metadata.
     const pattern = new RegExp(`(^|\\n|\\]\\s*)${escaped}:\\s`, "i");
     return pattern.test(body);
   });
diff --git a/src/imessage/monitor/monitor-provider.ts b/src/imessage/monitor/monitor-provider.ts
index 3970cd1b2..d780e446a 100644
--- a/src/imessage/monitor/monitor-provider.ts
+++ b/src/imessage/monitor/monitor-provider.ts
@@ -383,8 +383,8 @@ export async function monitorIMessageProvider(opts: MonitorIMessageOpts = {}): P
     }
 
     const chatTarget = formatIMessageChatTarget(chatId);
-    // For groups: use chat name or just "Group" (channel "iMessage" is already shown)
-    // For DMs: show sender, only add id: suffix if raw differs from normalized
+    // For groups: use chat name or just "Group" (channel "iMessage" is already shown).
+    // For DMs: keep headers compact; only add id: suffix if raw differs from normalized.
     const fromLabel = isGroup
       ? `${message.chat_name || "Group"} id:${chatId ?? "unknown"}`
       : senderNormalized === sender
diff --git a/src/signal/monitor/event-handler.ts b/src/signal/monitor/event-handler.ts
index 42a0f2dab..e53179afa 100644
--- a/src/signal/monitor/event-handler.ts
+++ b/src/signal/monitor/event-handler.ts
@@ -65,8 +65,8 @@ export function createSignalEventHandler(deps: SignalEventHandlerDeps) {
   };
 
   async function handleSignalInboundMessage(entry: SignalInboundEntry) {
-    // For groups: use group name or just "Group" (channel "Signal" is already shown)
-    // For DMs: show sender, only add id: suffix if display differs from name
+    // For groups: use group name or just "Group" (channel "Signal" is already shown).
+    // For DMs: keep headers compact; only add id: suffix if display differs from name.
     const fromLabel = entry.isGroup
       ? `${entry.groupName || "Group"} id:${entry.groupId}`
       : entry.senderName === entry.senderDisplay