thread fix

backend/app/routers/emails.py

@@ -27,6 +27,7 @@ from app.services.mail_sender import deliver_email
 from app.services.message_ids import canonical_message_id, message_id_fields
 from app.services.mime_parser import parse_mime
 from app.services.raw_mime_storage import get_raw_mime_storage
+from app.services.reply_extractor import build_reply_display, reply_fields_for_message
 from app.services.reply_recipients import reply_recipients
 from app.services.thread_service import (
     create_thread,
@@ -98,7 +99,12 @@ def summarize(message: dict, entry: dict) -> MessageSummary:
         sender=MailAddress(**sender),
         recipients=[MailAddress(**item) for item in recipients],
         subject=message.get("subject", ""),
-        snippet=message.get("snippet", message.get("body_text", "")[:240]),
+        snippet=message.get("snippet")
+        or re.sub(
+            r"\s+",
+            " ",
+            message.get("new_reply_content") or message.get("body_text", ""),
+        ).strip()[:240],
         status=message.get("status", "received"),
         created_at=message.get("received_at") or message["created_at"],
         is_read=entry.get("is_read", True),
@@ -200,6 +206,10 @@ async def create_email(
         }
         if not subject.strip():
             subject = reply_plan.subject
+    reply_display = build_reply_display(
+        body_text=payload.body_text,
+        body_html=payload.body_html,
+    )
     document = {
         "direction": "outbound",
         "message_scope": MESSAGE_SCOPE_EXTERNAL,
@@ -212,7 +222,10 @@ async def create_email(
         "cc": [address(value) for value in cc],
         "bcc": [address(value) for value in bcc],
         "subject": subject,
-        "snippet": re.sub(r"\s+", " ", payload.body_text).strip()[:240],
+        "snippet": reply_display["snippet"],
+        "new_reply_content": reply_display["new_reply_content"],
+        "quoted_content": reply_display["quoted_content"],
+        "has_quoted_text": reply_display["has_quoted_text"],
         "body_text": payload.body_text,
         "body_html": payload.body_html,
         "attachments": [],
@@ -371,6 +384,11 @@ async def get_email(
         body_text = parsed["body_text"]
         body_html = parsed["body_html"]
     summary = summarize(document, entry)
+    reply_fields = reply_fields_for_message(
+        document,
+        body_text=body_text,
+        body_html=body_html,
+    )
     return MessageRead(
         **summary.model_dump(),
         cc=document.get("cc", []),
@@ -378,6 +396,7 @@ async def get_email(
         reply_to=document.get("reply_to", []),
         body_text=body_text,
         body_html=body_html,
+        **reply_fields,
         message_id=document.get("message_id"),
         in_reply_to=document.get("in_reply_to"),
         references=document.get("references", []),

backend/app/routers/threads.py

@@ -14,6 +14,7 @@ from app.routers.emails import decode_cursor, encode_cursor, summarize
 from app.schemas import MessageRead, ThreadPage, ThreadRead, ThreadSummary
 from app.services.mailbox_scope import apply_external_scope
 from app.services.mime_parser import parse_mime
+from app.services.reply_extractor import reply_fields_for_message
 from app.services.raw_mime_storage import get_raw_mime_storage
 
 router = APIRouter(prefix="/threads", tags=["threads"])
@@ -241,6 +242,11 @@ async def message_read(
         body_text = parsed["body_text"]
         body_html = parsed["body_html"]
     summary = summarize(message, entry)
+    reply_fields = reply_fields_for_message(
+        message,
+        body_text=body_text,
+        body_html=body_html,
+    )
     return MessageRead(
         **summary.model_dump(),
         cc=message.get("cc", []),
@@ -248,6 +254,7 @@ async def message_read(
         reply_to=message.get("reply_to", []),
         body_text=body_text,
         body_html=body_html,
+        **reply_fields,
         message_id=message.get("message_id"),
         in_reply_to=message.get("in_reply_to"),
         references=message.get("references", []),

backend/app/schemas.py

@@ -406,6 +406,9 @@ class MessageRead(MessageSummary):
     reply_to: list[MailAddress] = Field(default_factory=list)
     body_text: str = ""
     body_html: str | None = None
+    new_reply_content: str = ""
+    quoted_content: str = ""
+    has_quoted_text: bool = False
     message_id: str | None = None
     in_reply_to: str | None = None
     references: list[str] = Field(default_factory=list)

backend/app/services/external_reply_service.py

@@ -17,6 +17,7 @@ from app.services.message_ids import (
     message_id_fields,
 )
 from app.services.mime_parser import parse_mime
+from app.services.reply_extractor import build_reply_display
 from app.services.raw_mime_storage import get_raw_mime_storage
 from app.services.thread_service import threading_fields_from_parent
 
@@ -410,6 +411,10 @@ async def send_external_reply(
     )
 
     now = datetime.now(timezone.utc)
+    reply_display = build_reply_display(
+        body_text=plan.body_text,
+        body_html=plan.body_html,
+    )
     document = {
         "direction": "outbound",
         "message_scope": MESSAGE_SCOPE_EXTERNAL,
@@ -417,7 +422,10 @@ async def send_external_reply(
         "sender": {"name": sender_name, "address": sender},
         "to": [{"name": value.split("@")[0], "address": value} for value in plan.recipients],
         "subject": plan.subject,
-        "snippet": re.sub(r"\s+", " ", plan.body_text).strip()[:240],
+        "snippet": reply_display["snippet"],
+        "new_reply_content": reply_display["new_reply_content"],
+        "quoted_content": reply_display["quoted_content"],
+        "has_quoted_text": reply_display["has_quoted_text"],
         "body_text": plan.body_text,
         "body_html": plan.body_html,
         "attachments": [],

backend/app/services/inbound_smtp.py

@@ -13,6 +13,7 @@ from app.services.external_reply_service import log_original_external_message
 from app.services.human_handoff_service import MESSAGE_SCOPE_EXTERNAL
 from app.services.message_ids import canonical_message_id, message_id_fields
 from app.services.mime_parser import parse_mime
+from app.services.reply_extractor import build_reply_display
 from app.services.raw_mime_storage import delivery_digest, get_raw_mime_storage
 from app.services.thread_resolver import participants_from_parsed, resolve_thread
 from app.services.thread_service import ensure_thread_for_message, message_event_at
@@ -155,12 +156,26 @@ class InboundHandler:
                 raise RuntimeError("Inbound message was not persisted.")
 
             if body_text or body_html:
+                reply_display = build_reply_display(body_text=body_text, body_html=body_html)
                 await mongo_db.messages.update_one(
                     {"_id": persisted["_id"]},
-                    {"$set": {"body_text": body_text, "body_html": body_html}},
+                    {
+                        "$set": {
+                            "body_text": body_text,
+                            "body_html": body_html,
+                            "new_reply_content": reply_display["new_reply_content"],
+                            "quoted_content": reply_display["quoted_content"],
+                            "has_quoted_text": reply_display["has_quoted_text"],
+                            "snippet": reply_display["snippet"],
+                        }
+                    },
                 )
                 persisted["body_text"] = body_text
                 persisted["body_html"] = body_html
+                persisted["snippet"] = reply_display["snippet"]
+                persisted["new_reply_content"] = reply_display["new_reply_content"]
+                persisted["quoted_content"] = reply_display["quoted_content"]
+                persisted["has_quoted_text"] = reply_display["has_quoted_text"]
 
             participants = participants_from_parsed(parsed)
             for recipient in recipients:
@@ -214,7 +229,7 @@ class InboundHandler:
                             "sender": parsed["sender"],
                             "recipients": parsed["to"],
                             "subject": parsed["subject"],
-                            "snippet": parsed["snippet"],
+                            "snippet": persisted.get("snippet", parsed["snippet"]),
                             "attachments": parsed["attachments"],
                             "status": "received",
                             "is_read": False,

backend/app/services/mime_parser.py

@@ -6,6 +6,7 @@ from email.utils import getaddresses, parsedate_to_datetime
 from html import unescape
 
 from app.services.message_ids import first_message_id, parse_message_id_list
+from app.services.reply_extractor import build_reply_display
 
 
 def _addresses(values: list[str]) -> list[dict[str, str]]:
@@ -36,11 +37,7 @@ def _header_str(value) -> str | None:
 
 
 def _snippet(text: str, html: str | None, limit: int = 240) -> str:
-    source = text
+    return build_reply_display(body_text=text, body_html=html, limit=limit)["snippet"]
-    if not source and html:
-        source = re.sub(r"<[^>]+>", " ", html)
-        source = unescape(source)
-    return re.sub(r"\s+", " ", source).strip()[:limit]
 
 
 def parse_mime(raw: bytes) -> dict:

backend/app/services/reply_extractor.py

@@ -4,19 +4,13 @@ from html import unescape
 # Patterns that mark the start of quoted previous-message content.
 TEXT_QUOTE_MARKERS = [
     re.compile(r"\n-{2,}\s*Original Message\s*-{2,}", re.IGNORECASE),
-    re.compile(
+    re.compile(r"(?:^|\n)\s*On .+? wrote:\s*", re.IGNORECASE),
-        r"\nOn .+? wrote:\s*\n",
-        re.IGNORECASE,
-    ),
-    re.compile(
-        r"\nOn .+?, .+? at .+? .+? wrote:\s*\n",
-        re.IGNORECASE,
-    ),
     re.compile(
         r"\nFrom:\s*.+\nSent:\s*.+\nTo:\s*.+\nSubject:\s*.+",
         re.IGNORECASE,
     ),
     re.compile(r"\n_{5,}\n"),
+    re.compile(r"\n\s*> ?"),
 ]
 
 HTML_QUOTE_PATTERNS = [
@@ -110,6 +104,46 @@ def extract_new_reply_content(
     }
 
 
+def reply_fields_for_message(
+    message: dict,
+    *,
+    body_text: str | None,
+    body_html: str | None = None,
+) -> dict[str, str | bool]:
+    if "new_reply_content" in message:
+        return {
+            "new_reply_content": message.get("new_reply_content", ""),
+            "quoted_content": message.get("quoted_content", ""),
+            "has_quoted_text": bool(message.get("has_quoted_text") or message.get("quoted_content")),
+        }
+    built = build_reply_display(body_text=body_text, body_html=body_html)
+    return {
+        "new_reply_content": built["new_reply_content"],
+        "quoted_content": built["quoted_content"],
+        "has_quoted_text": built["has_quoted_text"],
+    }
+
+
+def build_reply_display(
+    *,
+    body_text: str | None,
+    body_html: str | None = None,
+    limit: int = 240,
+) -> dict[str, str | bool]:
+    extracted = extract_new_reply_content(body_text=body_text, body_html=body_html)
+    new_content = extracted["new_reply_content"]
+    quoted = extracted["quoted_content"]
+    fallback = re.sub(r"\s+", " ", (body_text or "")).strip()
+    snippet_source = new_content or fallback
+    return {
+        "new_reply_content": new_content,
+        "quoted_content": quoted,
+        "has_quoted_text": bool(quoted),
+        "raw_body": extracted["raw_body"],
+        "snippet": re.sub(r"\s+", " ", snippet_source).strip()[:limit],
+    }
+
+
 def validate_external_reply_body(body: str) -> bool:
     normalized = (body or "").strip()
     if not normalized:

backend/tests/test_reply_extractor.py

@@ -49,6 +49,35 @@ def test_external_reply_subject_uses_customer_subject():
     assert external_reply_subject("Human Handoff · are you ready?") == "Re: are you ready?"
 
 
+def test_extracts_reply_before_blockquote_lines():
+    body = """responder: B
+> sender: A"""
+    result = extract_new_reply_content(body_text=body)
+    assert result["new_reply_content"] == "responder: B"
+    assert "sender: A" in result["quoted_content"]
+
+
+def test_extracts_reply_from_gmail_on_wrote_without_blank_line():
+    body = """sender: C
+On Tue, Oct 6, 2026 at 4:29 AM <suyash@gentic.email> wrote:
+> Responder: B
+> sender: A"""
+    result = extract_new_reply_content(body_text=body)
+    assert result["new_reply_content"] == "sender: C"
+    assert "Responder: B" in result["quoted_content"]
+
+
+def test_build_reply_display_uses_clean_snippet():
+    from app.services.reply_extractor import build_reply_display
+
+    body = """responder: D
+On Tue, Oct 6, 2026 at 4:29 AM wrote:
+> sender: C"""
+    result = build_reply_display(body_text=body)
+    assert result["snippet"] == "responder: D"
+    assert result["has_quoted_text"] is True
+
+
 def test_outlook_original_message_split():
     body = """Thanks for the update.
 

frontend/src/components/MailDetail.jsx

@@ -39,7 +39,13 @@ function joinAddresses(value) {
     .join(", ");
 }
 
+function messagePreview(message) {
+  return (message?.new_reply_content || message?.snippet || "").trim();
+}
+
 function messageBody(email) {
+  const preview = messagePreview(email);
+  if (preview) return { mode: "text", value: preview };
   const text = (email?.body_text || email?.text_body || email?.plain_text || "").trim();
   if (text) return { mode: "text", value: text };
   const html = (email?.body_html || "").trim();
@@ -49,6 +55,39 @@ function messageBody(email) {
   return { mode: "text", value: "This message has no readable content." };
 }
 
+function MessageBodyContent({ message }) {
+  const [showQuoted, setShowQuoted] = useState(false);
+  const body = messageBody(message);
+  const quoted = (message?.quoted_content || "").trim();
+  const hasQuoted = Boolean(message?.has_quoted_text && quoted);
+
+  return (
+    <>
+      <div className={`mail-detail-body${body.mode === "html" ? " is-html" : ""}`}>
+        {body.mode === "html" ? (
+          <div className="mail-detail-body-html" dangerouslySetInnerHTML={{ __html: body.value }} />
+        ) : (
+          <div className="mail-detail-body-text">{body.value}</div>
+        )}
+      </div>
+      {hasQuoted ? (
+        <button
+          type="button"
+          className="mail-quoted-toggle"
+          onClick={() => setShowQuoted((open) => !open)}
+          aria-expanded={showQuoted}
+          aria-label={showQuoted ? "Hide quoted text" : "Show quoted text"}
+        >
+          <span aria-hidden="true">···</span>
+        </button>
+      ) : null}
+      {showQuoted && quoted ? (
+        <pre className="mail-quoted-body">{quoted}</pre>
+      ) : null}
+    </>
+  );
+}
+
 function detailTime(email) {
   const value = email?.received_at || email?.sent_at || email?.created_at || email?.updated_at;
   if (!value) return { absolute: "", relative: "" };
@@ -149,7 +188,6 @@ function MessageBlock({
   onMove,
 }) {
   const [headersOpen, setHeadersOpen] = useState(false);
-  const body = messageBody(message);
   const time = detailTime(message);
   const sender = senderIdentity(message);
   const attachments = message?.attachments || [];
@@ -160,7 +198,7 @@ function MessageBlock({
         <SenderAvatar email={message} />
         <span className="mail-thread-message-collapsed-main">
           <strong>{sender?.name}</strong>
-          <span>{message.snippet || message.body_text || ""}</span>
+          <span>{messagePreview(message) || message.body_text || ""}</span>
         </span>
         <time>{time.absolute}</time>
       </button>
@@ -218,14 +256,8 @@ function MessageBlock({
           </MessageAction>
         </div>
       </div>
-      <div className={`mail-detail-message-content${body?.mode === "html" ? " is-html" : ""}`}>
+      <div className="mail-detail-message-content">
-        <div className={`mail-detail-body${body?.mode === "html" ? " is-html" : " is-text"}`}>
+        <MessageBodyContent message={message} />
-          {body?.mode === "html" ? (
-            <div className="mail-detail-body-html" dangerouslySetInnerHTML={{ __html: body.value }} />
-          ) : (
-            <div className="mail-detail-body-text">{body?.value}</div>
-          )}
-        </div>
         {attachments.length > 0 && (
           <div className="mail-detail-attachments" aria-label="Attachments">
             {attachments.map((file) => (

frontend/src/components/MailboxView.jsx

@@ -86,7 +86,7 @@ function buildReplyContext(message, replyAll = false) {
   const sender = message?.sender || { name: "", address: "" };
   const subject = (message?.subject || "").trim();
   const replySubject = /^re:/i.test(subject) ? subject : `Re: ${subject || "(No subject)"}`;
-  const quote = (message?.body_text || message?.snippet || "").trim();
+  const quote = (message?.new_reply_content || message?.body_text || message?.snippet || "").trim();
   return {
     replyToMessageId: message.id,
     replyAll,
@@ -781,7 +781,7 @@ export default function MailboxView({
                   const target = threadDetail?.messages?.[threadDetail.messages.length - 1] || detail;
                   onCompose?.({
                     subject: `Fwd: ${target?.subject || ""}`,
-                    bodyHtml: `<p><br></p><blockquote>${(target?.body_text || target?.snippet || "").replace(/\n/g, "<br>")}</blockquote>`,
+                    bodyHtml: `<p><br></p><blockquote>${(target?.new_reply_content || target?.body_text || target?.snippet || "").replace(/\n/g, "<br>")}</blockquote>`,
                   });
                 }}
                 onExtractActions={() => detail && extractActions(detail)}

frontend/src/styles.css

@@ -855,6 +855,9 @@ h1 em { color:var(--coral); font-style:normal; font-weight:500; }
 .mail-thread-message-collapsed-main strong { font:600 12px/1.3 "DM Sans"; color:#171424; }
 .mail-thread-message-collapsed-main span { overflow:hidden; text-overflow:ellipsis; white-space:nowrap; color:#77758a; font-size:11px; }
 .mail-thread-message-collapsed time { color:#77758a; font-size:11px; white-space:nowrap; }
+.mail-quoted-toggle { margin:10px 0 0; padding:2px 10px; border:1px solid #e8e5ee; border-radius:999px; background:#f7f6f9; color:#77758a; font-size:16px; line-height:1; letter-spacing:1px; cursor:pointer; }
+.mail-quoted-toggle:hover { background:#f1eff3; color:#4a4652; }
+.mail-quoted-body { margin:10px 0 0; padding:12px 14px; border-left:2px solid #e8e5ee; border-radius:0 8px 8px 0; background:#faf9fc; color:#77758a; font-size:12px; line-height:1.5; white-space:pre-wrap; overflow:auto; }
 .mailbox-thread-count { min-width:18px; height:18px; padding:0 6px; display:inline-grid; place-items:center; border-radius:999px; background:#f1eff3; color:#716d7a; font-size:10px; font-weight:600; }
 .agent-panel.email-context .agent-stat-grid,
 .agent-panel.email-context .agent-context-block,