calendar replies

src/cli/sync.py

@@ -425,7 +425,7 @@ async def _sync_outlook_data(
 
     # Define scopes for Microsoft Graph API
     scopes = [
-        "https://graph.microsoft.com/Calendars.ReadWrite",
+        "https://graph.microsoft.com/Calendars.Read",
         "https://graph.microsoft.com/Mail.ReadWrite",
     ]
 
@@ -721,7 +721,7 @@ def sync(
         # This prevents the TUI from appearing to freeze during device flow auth
         if not demo:
             scopes = [
-                "https://graph.microsoft.com/Calendars.ReadWrite",
+                "https://graph.microsoft.com/Calendars.Read",
                 "https://graph.microsoft.com/Mail.ReadWrite",
             ]
             if not has_valid_cached_token(scopes):
@@ -963,7 +963,7 @@ def interactive(org, vdir, notify, dry_run, demo):
     # This prevents the TUI from appearing to freeze during device flow auth
     if not demo:
         scopes = [
-            "https://graph.microsoft.com/Calendars.ReadWrite",
+            "https://graph.microsoft.com/Calendars.Read",
             "https://graph.microsoft.com/Mail.ReadWrite",
         ]
         if not has_valid_cached_token(scopes):

src/cli/sync_dashboard.py

@@ -1103,7 +1103,7 @@ async def run_dashboard_sync(
 
             # Get auth token
             scopes = [
-                "https://graph.microsoft.com/Calendars.ReadWrite",
+                "https://graph.microsoft.com/Calendars.Read",
                 "https://graph.microsoft.com/Mail.ReadWrite",
             ]
             access_token, headers = get_access_token(scopes)

src/mail/actions/calendar_invite.py

@@ -1,14 +1,22 @@
 """Calendar invite actions for mail app.
 
-Allows responding to calendar invites directly from email.
+Allows responding to calendar invites directly from email using ICS/SMTP.
+
+Uses the iTIP (iCalendar Transport-Independent Interoperability Protocol)
+standard to send REPLY messages via email instead of requiring Calendar.ReadWrite
+API permissions.
 """
 
-import asyncio
-import aiohttp
 import logging
 import os
+import time
+from datetime import datetime, timezone
+from email.mime.multipart import MIMEMultipart
+from email.mime.text import MIMEText
 from typing import Optional, Tuple
 
+from src.mail.utils.calendar_parser import ParsedCalendarEvent
+
 # Set up dedicated RSVP logger
 rsvp_logger = logging.getLogger("calendar_rsvp")
 rsvp_logger.setLevel(logging.DEBUG)
@@ -22,145 +30,306 @@ if not rsvp_logger.handlers:
     handler.setFormatter(logging.Formatter("%(asctime)s - %(levelname)s - %(message)s"))
     rsvp_logger.addHandler(handler)
 
-# Timeout for API calls (seconds)
-API_TIMEOUT = 15
 
-# Required scopes for calendar operations
-CALENDAR_SCOPES = [
-    "https://graph.microsoft.com/Calendars.ReadWrite",
+def _get_user_email() -> Optional[str]:
+    """Get the current user's email address from MSAL cache.
+
+    Returns:
+        User's email address if found, None otherwise.
+    """
+    import msal
+
+    client_id = os.getenv("AZURE_CLIENT_ID")
+    tenant_id = os.getenv("AZURE_TENANT_ID")
+
+    if not client_id or not tenant_id:
+        rsvp_logger.warning("Azure credentials not configured")
+        return None
+
+    cache_file = os.path.expanduser("~/.local/share/luk/token_cache.bin")
+    if not os.path.exists(cache_file):
+        rsvp_logger.warning("Token cache file not found")
+        return None
+
+    try:
+        cache = msal.SerializableTokenCache()
+        cache.deserialize(open(cache_file, "r").read())
+        authority = f"https://login.microsoftonline.com/{tenant_id}"
+        app = msal.PublicClientApplication(
+            client_id, authority=authority, token_cache=cache
+        )
+        accounts = app.get_accounts()
+
+        if accounts:
+            # The username field contains the user's email
+            return accounts[0].get("username")
+        return None
+    except Exception as e:
+        rsvp_logger.error(f"Failed to get user email from MSAL: {e}")
+        return None
+
+
+def _get_user_display_name() -> Optional[str]:
+    """Get the current user's display name from MSAL cache.
+
+    Returns:
+        User's display name if found, None otherwise.
+    """
+    import msal
+
+    client_id = os.getenv("AZURE_CLIENT_ID")
+    tenant_id = os.getenv("AZURE_TENANT_ID")
+
+    if not client_id or not tenant_id:
+        return None
+
+    cache_file = os.path.expanduser("~/.local/share/luk/token_cache.bin")
+    if not os.path.exists(cache_file):
+        return None
+
+    try:
+        cache = msal.SerializableTokenCache()
+        cache.deserialize(open(cache_file, "r").read())
+        authority = f"https://login.microsoftonline.com/{tenant_id}"
+        app = msal.PublicClientApplication(
+            client_id, authority=authority, token_cache=cache
+        )
+        accounts = app.get_accounts()
+
+        if accounts:
+            # Try to get name from account, fallback to username
+            name = accounts[0].get("name")
+            if name:
+                return name
+            # Fallback: construct name from email
+            username = accounts[0].get("username", "")
+            if "@" in username:
+                local_part = username.split("@")[0]
+                # Convert firstname.lastname to Firstname Lastname
+                parts = local_part.replace(".", " ").replace("_", " ").split()
+                return " ".join(p.capitalize() for p in parts)
+        return None
+    except Exception as e:
+        rsvp_logger.debug(f"Failed to get display name: {e}")
+        return None
+
+
+def generate_ics_reply(
+    event: ParsedCalendarEvent,
+    response: str,
+    attendee_email: str,
+    attendee_name: Optional[str] = None,
+) -> str:
+    """Generate an iCalendar REPLY for a calendar invite.
+
+    Args:
+        event: The parsed calendar event from the original invite
+        response: Response type - 'ACCEPTED', 'TENTATIVE', or 'DECLINED'
+        attendee_email: The attendee's email address
+        attendee_name: The attendee's display name (optional)
+
+    Returns:
+        ICS content string formatted as an iTIP REPLY
+    """
+    # Map response to PARTSTAT value
+    partstat_map = {
+        "accept": "ACCEPTED",
+        "tentativelyAccept": "TENTATIVE",
+        "decline": "DECLINED",
+    }
+    partstat = partstat_map.get(response, "ACCEPTED")
+
+    # Generate DTSTAMP in UTC format
+    dtstamp = datetime.now(timezone.utc).strftime("%Y%m%dT%H%M%SZ")
+
+    # Build attendee line with proper formatting
+    if attendee_name:
+        attendee_line = (
+            f'ATTENDEE;PARTSTAT={partstat};CN="{attendee_name}":MAILTO:{attendee_email}'
+        )
+    else:
+        attendee_line = f"ATTENDEE;PARTSTAT={partstat}:MAILTO:{attendee_email}"
+
+    # Build organizer line
+    if event.organizer_name:
+        organizer_line = (
+            f'ORGANIZER;CN="{event.organizer_name}":MAILTO:{event.organizer_email}'
+        )
+    else:
+        organizer_line = f"ORGANIZER:MAILTO:{event.organizer_email}"
+
+    # Build the response subject prefix
+    response_prefix = {
+        "accept": "Accepted",
+        "tentativelyAccept": "Tentative",
+        "decline": "Declined",
+    }.get(response, "Accepted")
+
+    summary = f"{response_prefix}: {event.summary or '(no subject)'}"
+
+    # Build the ICS content following iTIP REPLY standard
+    ics_lines = [
+        "BEGIN:VCALENDAR",
+        "VERSION:2.0",
+        "PRODID:-//LUK Mail//Calendar Reply//EN",
+        "METHOD:REPLY",
+        "BEGIN:VEVENT",
+        f"UID:{event.uid}",
+        f"DTSTAMP:{dtstamp}",
+        organizer_line,
+        attendee_line,
+        f"SEQUENCE:{event.sequence}",
+        f"SUMMARY:{summary}",
+        "END:VEVENT",
+        "END:VCALENDAR",
     ]
 
-
-def _get_auth_headers_sync() -> Optional[dict]:
-    """Get auth headers synchronously using cached token only.
-
-    Returns None if no valid cached token exists (to avoid blocking on device flow).
-    """
-    from src.services.microsoft_graph.auth import (
-        has_valid_cached_token,
-        get_access_token,
-    )
-
-    rsvp_logger.debug("Checking for valid cached token...")
-
-    if not has_valid_cached_token(CALENDAR_SCOPES):
-        rsvp_logger.warning("No valid cached token found")
-        return None
-
-    try:
-        rsvp_logger.debug("Getting access token from cache...")
-        _, headers = get_access_token(CALENDAR_SCOPES)
-        rsvp_logger.debug("Got auth headers successfully")
-        return headers
-    except Exception as e:
-        rsvp_logger.error(f"Failed to get auth headers: {e}")
-        return None
+    return "\r\n".join(ics_lines)
 
 
-async def find_event_by_uid(uid: str, headers: dict) -> Optional[dict]:
-    """Find a calendar event by its iCalUId.
+def build_calendar_reply_email(
+    event: ParsedCalendarEvent,
+    response: str,
+    from_email: str,
+    to_email: str,
+    from_name: Optional[str] = None,
+) -> str:
+    """Build a MIME email with calendar REPLY attachment.
+
+    The email is formatted according to iTIP/iMIP standards so that
+    Exchange/Outlook will recognize it as a calendar action.
 
     Args:
-        uid: The iCalendar UID from the ICS file
-        headers: Auth headers for MS Graph API
-
-    Returns:
-        Event dict if found, None otherwise
-    """
-    rsvp_logger.info(f"Looking up event by UID: {uid}")
-
-    try:
-        # Search by iCalUId - this is the unique identifier that should match
-        uid_escaped = uid.replace("'", "''")
-        url = (
-            f"https://graph.microsoft.com/v1.0/me/events?"
-            f"$filter=iCalUId eq '{uid_escaped}'&"
-            f"$select=id,subject,organizer,start,end,responseStatus,iCalUId"
-        )
-
-        rsvp_logger.debug(f"Request URL: {url}")
-
-        # Use aiohttp directly with timeout
-        timeout = aiohttp.ClientTimeout(total=API_TIMEOUT)
-        async with aiohttp.ClientSession(timeout=timeout) as session:
-            async with session.get(url, headers=headers) as response:
-                rsvp_logger.debug(f"Response status: {response.status}")
-
-                if response.status != 200:
-                    error_text = await response.text()
-                    rsvp_logger.error(f"API error: {response.status} - {error_text}")
-                    return None
-
-                data = await response.json()
-                events = data.get("value", [])
-
-                rsvp_logger.info(f"Found {len(events)} events matching UID")
-
-                if events:
-                    event = events[0]
-                    rsvp_logger.debug(
-                        f"Event found: {event.get('subject')} - ID: {event.get('id')}"
-                    )
-                    return event
-
-                return None
-
-    except asyncio.TimeoutError:
-        rsvp_logger.error(f"Timeout after {API_TIMEOUT}s looking up event by UID")
-        return None
-    except Exception as e:
-        rsvp_logger.error(f"Error finding event by UID: {e}", exc_info=True)
-        return None
-
-
-async def respond_to_calendar_invite(
-    event_id: str, response: str, headers: dict
-) -> Tuple[bool, str]:
-    """Respond to a calendar invite.
-
-    Args:
-        event_id: Microsoft Graph event ID
+        event: The parsed calendar event from the original invite
         response: Response type - 'accept', 'tentativelyAccept', or 'decline'
-        headers: Auth headers for MS Graph API
+        from_email: Sender's email address
+        to_email: Recipient's email address (the organizer)
+        from_name: Sender's display name (optional)
 
     Returns:
-        Tuple of (success, message)
+        Complete RFC 5322 email as string
     """
-    rsvp_logger.info(f"Responding to event {event_id} with: {response}")
+    # Generate the ICS reply content
+    ics_content = generate_ics_reply(event, response, from_email, from_name)
 
-    try:
-        response_url = (
-            f"https://graph.microsoft.com/v1.0/me/events/{event_id}/{response}"
-        )
-        rsvp_logger.debug(f"Response URL: {response_url}")
-
-        # Use aiohttp directly with timeout
-        timeout = aiohttp.ClientTimeout(total=API_TIMEOUT)
-        async with aiohttp.ClientSession(timeout=timeout) as session:
-            async with session.post(response_url, headers=headers, json={}) as resp:
-                rsvp_logger.debug(f"Response status: {resp.status}")
-
-                if resp.status in (200, 202):
+    # Build response text for email body
     response_text = {
         "accept": "accepted",
         "tentativelyAccept": "tentatively accepted",
         "decline": "declined",
-                    }.get(response, response)
-                    rsvp_logger.info(f"Successfully {response_text} the meeting")
-                    return True, f"Successfully {response_text} the meeting"
-                else:
-                    error_text = await resp.text()
-                    rsvp_logger.error(
-                        f"Failed to respond: {resp.status} - {error_text}"
-                    )
-                    return False, f"Failed to respond: {resp.status}"
+    }.get(response, "accepted")
+
+    subject_prefix = {
+        "accept": "Accepted",
+        "tentativelyAccept": "Tentative",
+        "decline": "Declined",
+    }.get(response, "Accepted")
+
+    subject = f"{subject_prefix}: {event.summary or '(no subject)'}"
+
+    # Create the email message
+    msg = MIMEMultipart("mixed")
+
+    # Set headers
+    if from_name:
+        msg["From"] = f'"{from_name}" <{from_email}>'
+    else:
+        msg["From"] = from_email
+
+    msg["To"] = to_email
+    msg["Subject"] = subject
+
+    # Add Content-Class header for Exchange compatibility
+    msg["Content-Class"] = "urn:content-classes:calendarmessage"
+
+    # Create text body
+    body_text = f"This meeting has been {response_text}."
+    text_part = MIMEText(body_text, "plain", "utf-8")
+    msg.attach(text_part)
+
+    # Create calendar part with proper iTIP headers
+    # The content-type must include method=REPLY for Exchange to recognize it
+    calendar_part = MIMEText(ics_content, "calendar", "utf-8")
+    calendar_part.set_param("method", "REPLY")
+    calendar_part.add_header("Content-Disposition", "attachment", filename="invite.ics")
+    msg.attach(calendar_part)
+
+    return msg.as_string()
+
+
+def queue_calendar_reply(
+    event: ParsedCalendarEvent,
+    response: str,
+    from_email: str,
+    to_email: str,
+    from_name: Optional[str] = None,
+) -> Tuple[bool, str]:
+    """Queue a calendar reply email for sending via the outbox.
+
+    Args:
+        event: The parsed calendar event from the original invite
+        response: Response type - 'accept', 'tentativelyAccept', or 'decline'
+        from_email: Sender's email address
+        to_email: Recipient's email address (the organizer)
+        from_name: Sender's display name (optional)
+
+    Returns:
+        Tuple of (success, message)
+    """
+    try:
+        # Build the email
+        email_content = build_calendar_reply_email(
+            event, response, from_email, to_email, from_name
+        )
+
+        # Determine organization from email domain
+        org = "default"
+        if "@" in from_email:
+            domain = from_email.split("@")[1].lower()
+            # Map known domains to org names (matching sendmail script logic)
+            domain_to_org = {
+                "corteva.com": "corteva",
+            }
+            org = domain_to_org.get(domain, domain.split(".")[0])
+
+        # Queue the email in the outbox
+        base_path = os.path.expanduser(os.getenv("MAILDIR_PATH", "~/Mail"))
+        outbox_path = os.path.join(base_path, org, "outbox")
+
+        # Ensure directories exist
+        for subdir in ["new", "cur", "tmp", "failed"]:
+            dir_path = os.path.join(outbox_path, subdir)
+            os.makedirs(dir_path, exist_ok=True)
+
+        # Generate unique filename
+        timestamp = str(int(time.time() * 1000000))
+        hostname = os.uname().nodename
+        filename = f"{timestamp}.{os.getpid()}.{hostname}"
+
+        # Write to tmp first, then move to new (atomic operation)
+        tmp_path = os.path.join(outbox_path, "tmp", filename)
+        new_path = os.path.join(outbox_path, "new", filename)
+
+        with open(tmp_path, "w", encoding="utf-8") as f:
+            f.write(email_content)
+
+        os.rename(tmp_path, new_path)
+
+        response_text = {
+            "accept": "accepted",
+            "tentativelyAccept": "tentatively accepted",
+            "decline": "declined",
+        }.get(response, "accepted")
+
+        rsvp_logger.info(
+            f"Queued calendar reply: {response_text} for '{event.summary}' to {event.organizer_email}"
+        )
+
+        return True, f"Response queued - will be sent on next sync"
 
-    except asyncio.TimeoutError:
-        rsvp_logger.error(f"Timeout after {API_TIMEOUT}s responding to invite")
-        return False, f"Request timed out after {API_TIMEOUT}s"
     except Exception as e:
-        rsvp_logger.error(f"Error responding to invite: {e}", exc_info=True)
-        return False, f"Error: {str(e)}"
+        rsvp_logger.error(f"Failed to queue calendar reply: {e}", exc_info=True)
+        return False, f"Failed to queue response: {str(e)}"
 
 
 def action_accept_invite(app):
@@ -179,7 +348,7 @@ def action_tentative_invite(app):
 
 
 def _respond_to_current_invite(app, response: str):
-    """Helper to respond to the current message's calendar invite."""
+    """Helper to respond to the current message's calendar invite using ICS/SMTP."""
     from src.mail.widgets.ContentContainer import ContentContainer
 
     rsvp_logger.info(f"Starting invite response: {response}")
@@ -190,18 +359,19 @@ def _respond_to_current_invite(app, response: str):
         app.notify("No message selected", severity="warning")
         return
 
-    # Get auth headers FIRST (synchronously, before spawning worker)
-    # This uses cached token only - won't block on device flow
-    headers = _get_auth_headers_sync()
-    if not headers:
-        rsvp_logger.error("No valid auth token - user needs to run luk sync first")
+    # Get user's email from MSAL cache
+    user_email = _get_user_email()
+    if not user_email:
+        rsvp_logger.error("Could not determine user email - run 'luk sync' first")
         app.notify(
-            "Not authenticated. Run 'luk sync' first to login.", severity="error"
+            "Could not determine your email. Run 'luk sync' first.", severity="error"
         )
         return
 
+    user_name = _get_user_display_name()
+    rsvp_logger.debug(f"User: {user_name} <{user_email}>")
+
     # Get the parsed calendar event from ContentContainer
-    # This has the UID from the ICS which we can use for direct lookup
     calendar_event = None
     try:
         content_container = app.query_one(ContentContainer)
@@ -216,61 +386,36 @@ def _respond_to_current_invite(app, response: str):
 
     event_uid = calendar_event.uid
     event_summary = calendar_event.summary or "(no subject)"
+    organizer_email = calendar_event.organizer_email
 
-    rsvp_logger.info(f"Calendar event: {event_summary}, UID: {event_uid}")
+    rsvp_logger.info(
+        f"Calendar event: {event_summary}, UID: {event_uid}, Organizer: {organizer_email}"
+    )
 
     if not event_uid:
         rsvp_logger.warning("No UID found in calendar event")
         app.notify("Calendar invite missing UID - cannot respond", severity="warning")
         return
 
-    app.run_worker(
-        _async_respond_to_invite(app, event_uid, event_summary, response, headers),
-        exclusive=True,
-        name="respond_invite",
-    )
-
-
-async def _async_respond_to_invite(
-    app, event_uid: str, event_summary: str, response: str, headers: dict
-):
-    """Async worker to find and respond to calendar invite using UID."""
-    rsvp_logger.info(f"Async response started for UID: {event_uid}")
-
-    app.notify(f"Looking up event...")
-
-    # Find event by UID (direct lookup, no search needed)
-    graph_event = await find_event_by_uid(event_uid, headers)
-
-    if not graph_event:
-        rsvp_logger.warning(f"Event not found for UID: {event_uid}")
+    if not organizer_email:
+        rsvp_logger.warning("No organizer email found in calendar event")
         app.notify(
-            f"Event not found in calendar: {event_summary[:40]}",
-            severity="warning",
+            "Calendar invite missing organizer - cannot respond", severity="warning"
         )
         return
 
-    event_id = graph_event.get("id")
-    if not event_id:
-        rsvp_logger.error("No event ID in response")
-        app.notify("Could not get event ID from calendar", severity="error")
-        return
-
-    current_response = graph_event.get("responseStatus", {}).get("response", "")
-    rsvp_logger.debug(f"Current response status: {current_response}")
-
-    # Check if already responded
-    if current_response == "accepted" and response == "accept":
-        rsvp_logger.info("Already accepted")
-        app.notify("Already accepted this invite", severity="information")
-        return
-    elif current_response == "declined" and response == "decline":
-        rsvp_logger.info("Already declined")
-        app.notify("Already declined this invite", severity="information")
-        return
-
-    # Respond to the invite
-    success, message = await respond_to_calendar_invite(event_id, response, headers)
+    # Queue the calendar reply (organizer_email is guaranteed non-None here)
+    success, message = queue_calendar_reply(
+        calendar_event, response, user_email, organizer_email, user_name
+    )
 
     severity = "information" if success else "error"
     app.notify(message, severity=severity)
+
+    if success:
+        response_text = {
+            "accept": "Accepted",
+            "tentativelyAccept": "Tentatively accepted",
+            "decline": "Declined",
+        }.get(response, "Responded to")
+        rsvp_logger.info(f"{response_text} invite: {event_summary}")

src/mail/utils/calendar_parser.py

@@ -41,6 +41,9 @@ class ParsedCalendarEvent:
     # UID for matching with Graph API
     uid: Optional[str] = None
 
+    # Sequence number for iTIP REPLY
+    sequence: int = 0
+
 
 def extract_ics_from_mime(raw_message: str) -> Optional[str]:
     """Extract ICS calendar content from raw MIME message.
@@ -200,6 +203,15 @@ def parse_ics_content(ics_content: str) -> Optional[ParsedCalendarEvent]:
         if dtend:
             end_dt = dtend.dt
 
+        # Extract sequence number (defaults to 0)
+        sequence = 0
+        seq_val = event.get("sequence")
+        if seq_val is not None:
+            try:
+                sequence = int(seq_val)
+            except (ValueError, TypeError):
+                sequence = 0
+
         return ParsedCalendarEvent(
             summary=str(event.get("summary", "")) or None,
             location=str(event.get("location", "")) or None,
@@ -213,6 +225,7 @@ def parse_ics_content(ics_content: str) -> Optional[ParsedCalendarEvent]:
             attendees=attendees,
             status=str(event.get("status", "")).upper() or None,
             uid=str(event.get("uid", "")) or None,
+            sequence=sequence,
         )
 
     except Exception as e:

src/services/microsoft_graph/mail.py

@@ -2,6 +2,7 @@
 Mail operations for Microsoft Graph API.
 """
 
+import base64
 import os
 import re
 import glob
@@ -860,30 +861,90 @@ def parse_email_for_graph_api(email_content: str) -> Dict[str, Any]:
     cc_recipients = parse_recipients(msg.get("Cc", ""))
     bcc_recipients = parse_recipients(msg.get("Bcc", ""))
 
-    # Get body content
+    # Get body content and attachments
     body_content = ""
     body_type = "text"
+    attachments: List[Dict[str, Any]] = []
 
     if msg.is_multipart():
         for part in msg.walk():
-            if part.get_content_type() == "text/plain":
-                body_content = part.get_payload(decode=True).decode(
-                    "utf-8", errors="ignore"
-                )
+            content_type = part.get_content_type()
+            content_disposition = part.get("Content-Disposition", "")
+
+            # Skip multipart containers
+            if content_type.startswith("multipart/"):
+                continue
+
+            # Handle text/plain body
+            if content_type == "text/plain" and "attachment" not in content_disposition:
+                payload = part.get_payload(decode=True)
+                if payload:
+                    body_content = payload.decode("utf-8", errors="ignore")
                     body_type = "text"
-                break
-            elif part.get_content_type() == "text/html":
-                body_content = part.get_payload(decode=True).decode(
-                    "utf-8", errors="ignore"
-                )
+
+            # Handle text/html body
+            elif (
+                content_type == "text/html" and "attachment" not in content_disposition
+            ):
+                payload = part.get_payload(decode=True)
+                if payload:
+                    body_content = payload.decode("utf-8", errors="ignore")
                     body_type = "html"
+
+            # Handle calendar attachments (text/calendar)
+            elif content_type == "text/calendar":
+                payload = part.get_payload(decode=True)
+                if payload:
+                    # Get filename from Content-Disposition or use default
+                    filename = part.get_filename() or "invite.ics"
+
+                    # Base64 encode the content for Graph API
+                    content_bytes = (
+                        payload
+                        if isinstance(payload, bytes)
+                        else payload.encode("utf-8")
+                    )
+
+                    attachments.append(
+                        {
+                            "@odata.type": "#microsoft.graph.fileAttachment",
+                            "name": filename,
+                            "contentType": "text/calendar; method=REPLY",
+                            "contentBytes": base64.b64encode(content_bytes).decode(
+                                "ascii"
+                            ),
+                        }
+                    )
+
+            # Handle other attachments
+            elif "attachment" in content_disposition or part.get_filename():
+                payload = part.get_payload(decode=True)
+                if payload:
+                    filename = part.get_filename() or "attachment"
+                    content_bytes = (
+                        payload
+                        if isinstance(payload, bytes)
+                        else payload.encode("utf-8")
+                    )
+                    attachments.append(
+                        {
+                            "@odata.type": "#microsoft.graph.fileAttachment",
+                            "name": filename,
+                            "contentType": content_type,
+                            "contentBytes": base64.b64encode(content_bytes).decode(
+                                "ascii"
+                            ),
+                        }
+                    )
     else:
-        body_content = msg.get_payload(decode=True).decode("utf-8", errors="ignore")
+        payload = msg.get_payload(decode=True)
+        if payload:
+            body_content = payload.decode("utf-8", errors="ignore")
             if msg.get_content_type() == "text/html":
                 body_type = "html"
 
     # Build Graph API message
-    message = {
+    message: Dict[str, Any] = {
         "subject": msg.get("Subject", ""),
         "body": {"contentType": body_type, "content": body_content},
         "toRecipients": to_recipients,
@@ -891,6 +952,10 @@ def parse_email_for_graph_api(email_content: str) -> Dict[str, Any]:
         "bccRecipients": bcc_recipients,
     }
 
+    # Add attachments if present
+    if attachments:
+        message["attachments"] = attachments
+
     # Add reply-to if present
     reply_to = msg.get("Reply-To", "")
     if reply_to: