--- mboxattachments.py	2020-06-02 01:34:19.784170000 +0200
+++ mboxattachments.py	2020-06-02 01:37:16.055170000 +0200
@@ -243,14 +243,19 @@
      
 
             
-    def filter_mbox(self, obj):
+    def filter_mailbox(self, obj):
         """ Filter a mbox file or mailbox.mbox instance. """
         if isinstance(obj, str):
             if os.path.isfile(obj):
                 obj = mailbox.mbox(obj)
+            elif os.path.isdir(obj):
+                obj = mailbox.Maildir(obj)
+            else
+                return
+
         for mail in obj:
             self.filter_mail(mail)
-        if isinstance(obj, mailbox.mbox):
+        if isinstance(obj, mailbox.Mailbox):
             obj.close()
 
     def filter_mail(self, mail):
@@ -545,7 +550,7 @@
                       debugging=debugging, SQstart=SQstart)
         
         for mbox in args:
-            filt.filter_mbox(mbox)
+            filt.filter_mailbox(mbox)
      
         print("\n\n%s emails were filtered, %s emails passed, "
             "\nprocessing of %s emails failed, "