diff --git a/gpgmymail b/gpgmymail
index 0be804b..1125fe0 100755
--- a/gpgmymail
+++ b/gpgmymail
@@ -44,7 +44,7 @@ def is_message_encrypted(message: email.message.Message) -> bool:
     Currently just does it by checking the content type header:
     https://stackoverflow.com/questions/18819126/checking-encryption-status-of-email"""
 
-    return message.get_content_type() == "multipart/encrypted"
+    return message.get_content_subtype() == "encrypted"
 
 def encrypt(
         message: email.message.Message,