diff --git a/bridge/slack/helpers.go b/bridge/slack/helpers.go
index 9959d4fa..4d191c0d 100644
--- a/bridge/slack/helpers.go
+++ b/bridge/slack/helpers.go
@@ -254,6 +254,13 @@ func (b *Bslack) populateReceivedMessage(ev *slack.MessageEvent) (*config.Messag
 		}
 	}
 
+	// For edits, only submessage has thread ts.
+	// Ensures edits to threaded messages maintain their prefix hint on the
+	// unthreaded end.
+	if ev.SubMessage != nil {
+		rmsg.ParentID = ev.SubMessage.ThreadTimestamp
+	}
+
 	if err = b.populateMessageWithUserInfo(ev, rmsg); err != nil {
 		return nil, err
 	}
diff --git a/bridge/slack/slack.go b/bridge/slack/slack.go
index 001b1268..1685c4fc 100644
--- a/bridge/slack/slack.go
+++ b/bridge/slack/slack.go
@@ -293,6 +293,12 @@ func (b *Bslack) sendRTM(msg config.Message) (string, error) {
 		return "", err
 	}
 
+	// Handle prefix hint for unthreaded messages.
+	if msg.ParentID == "msg-parent-not-found" {
+		msg.ParentID = ""
+		msg.Text = fmt.Sprintf("[thread]: %s", msg.Text)
+	}
+
 	// Handle message deletions.
 	if handled, err = b.deleteMessage(&msg, channelInfo); handled {
 		return msg.ID, err
diff --git a/gateway/gateway.go b/gateway/gateway.go
index 6fe19963..72d0831b 100644
--- a/gateway/gateway.go
+++ b/gateway/gateway.go
@@ -398,6 +398,12 @@ func (gw *Gateway) SendMessage(origmsg config.Message, dest *bridge.Bridge, chan
 		msg.ParentID = canonicalParentMsgID
 	}
 
+	// if the parentID is still empty and we have a parentID set in the original message
+	// this means that we didn't find it in the cache so set it "msg-parent-not-found"
+	if msg.ParentID == "" && origmsg.ParentID != "" {
+		msg.ParentID = "msg-parent-not-found"
+	}
+
 	// if we are using mattermost plugin account, send messages to MattermostPlugin channel
 	// that can be picked up by the mattermost matterbridge plugin
 	if dest.Account == "mattermost.plugin" {