diff --git a/app/plugins/builtins/mail/services.py b/app/plugins/builtins/mail/services.py
index 55930e1..506c7ab 100644
--- a/app/plugins/builtins/mail/services.py
+++ b/app/plugins/builtins/mail/services.py
@@ -255,10 +255,10 @@ async def imap_sync_account(
             uid_str = uid.decode() if isinstance(uid, bytes) else str(uid)
             fetch_resp = await client.uid('fetch', uid_str, '(RFC822)')
             raw_email = None
-            # aioimaplib Response: lines[0]='OK', lines[1]=[header_bytes, data_bytearray]
-            for line in fetch_resp.lines if hasattr(fetch_resp, 'lines') else fetch_resp:
-                if isinstance(line, (list, tuple)) and len(line) >= 2:
-                    raw_email = line[1]
+            # aioimaplib Response lines: [header_bytes, data_bytearray, closing_bytes, completion_bytes]
+            for line in (fetch_resp.lines if hasattr(fetch_resp, 'lines') else fetch_resp):
+                if isinstance(line, bytearray):
+                    raw_email = bytes(line)
                     break
             if raw_email is None:
                 continue