diff --git a/screenless/bureau/mailroom/mailroom.py b/screenless/bureau/mailroom/mailroom.py
index d5af694..ae8e6ec 100644
--- a/screenless/bureau/mailroom/mailroom.py
+++ b/screenless/bureau/mailroom/mailroom.py
@@ -180,6 +180,16 @@ class MailRoom(Bureau):
         self.imapserv.delete_messages((imap_id))
         self.imapserv.expunge()
 
+    @add_command("un", "Mark as unread")
+    def mark_unread(self, data):
+        """
+        Flags an email as unseen (so you can deal with it later).
+        """
+        shortcode, _ = data.split(".")
+        imap_id = self.get_imap_id(shortcode)
+        self._connect_imap()
+        self.imapserv.remove_flags(imap_id, [imapclient.SEEN])
+
     @add_command("re", "Reply with scan")
     def reply_scan(self, data):
         """