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
-    if not source and html:
-        source = re.sub(r"<[^>]+>", " ", html)
-        source = unescape(source)
-    return re.sub(r"\s+", " ", source).strip()[:limit]
+    return build_reply_display(body_text=text, body_html=html, limit=limit)["snippet"]
 
 
 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(
-        r"\nOn .+? wrote:\s*\n",
-        re.IGNORECASE,
-    ),
-    re.compile(
-        r"\nOn .+?, .+? at .+? .+? wrote:\s*\n",
-        re.IGNORECASE,
-    ),
+    re.compile(r"(?:^|\n)\s*On .+? wrote:\s*", 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.