diff --git a/fix-duplicate-mail-ids b/fix-duplicate-mail-ids
new file mode 100644
index 0000000..cba9d34
--- /dev/null
+++ b/fix-duplicate-mail-ids
@@ -0,0 +1,5 @@
+#!/bin/sh
+
+ID=$1; shift
+
+find ~/Maildir -name "*U=${ID}:*" -exec ls -l {} \;