basically refactored the email viewer

utils/mail_utils/helpers.py

@@ -5,6 +5,7 @@ import os
 import json
 import time
 from datetime import datetime
+import email.utils
 
 def truncate_id(message_id, length=8):
     """
@@ -67,6 +68,24 @@ def format_datetime(dt_str, format_string="%m/%d %I:%M %p"):
     except (ValueError, AttributeError):
         return dt_str
 
+def format_mime_date(dt_str):
+    """
+    Format a datetime string from ISO format to RFC 5322 format for MIME Date headers.
+
+    Args:
+        dt_str (str): ISO format datetime string.
+
+    Returns:
+        str: Formatted datetime string in RFC 5322 format.
+    """
+    if not dt_str:
+        return ""
+    try:
+        dt = datetime.fromisoformat(dt_str.replace('Z', '+00:00'))
+        return email.utils.format_datetime(dt)
+    except (ValueError, AttributeError):
+        return dt_str
+
 def safe_filename(filename):
     """
     Convert a string to a safe filename.

utils/mail_utils/maildir.py

@@ -13,7 +13,7 @@ import aiohttp
 import re
 
 from utils.calendar_utils import truncate_id
-from utils.mail_utils.helpers import safe_filename, ensure_directory_exists, format_datetime
+from utils.mail_utils.helpers import safe_filename, ensure_directory_exists, format_datetime, format_mime_date
 
 async def save_mime_to_maildir_async(maildir_path, message, attachments_dir, headers, progress, dry_run=False, download_attachments=False):
     """
@@ -92,10 +92,10 @@ async def create_mime_message_async(message, headers, attachments_dir, progress,
         cc_list = [f"{r.get('emailAddress', {}).get('name', '')} <{r.get('emailAddress', {}).get('address', '')}>".strip() for r in cc_recipients]
         mime_msg['Cc'] = ', '.join(cc_list)
 
-    # Date
+    # Date - using the new format_mime_date function to ensure RFC 5322 compliance
     received_datetime = message.get('receivedDateTime', '')
     if received_datetime:
-        mime_msg['Date'] = received_datetime
+        mime_msg['Date'] = format_mime_date(received_datetime)
 
     # First try the direct body content approach
     message_id = message.get('id', '')