diff --git a/chatmaild/src/chatmaild/filtermail.py b/chatmaild/src/chatmaild/filtermail.py
index 619989ae..eaa7d912 100644
--- a/chatmaild/src/chatmaild/filtermail.py
+++ b/chatmaild/src/chatmaild/filtermail.py
@@ -111,7 +111,7 @@ def check_encrypted(message):
     """
     if not message.is_multipart():
         return False
-    if message.get("subject") != "...":
+    if message.get("subject") not in {"...", "[...]"}:
         return False
     if message.get_content_type() != "multipart/encrypted":
         return False