diff --git a/mailnews/base/public/nsISubscribeListener.idl b/mailnews/base/public/nsISubscribeListener.idl
new file mode 100644
index 000000000000..0c51fe0273d9
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+++ b/mailnews/base/public/nsISubscribeListener.idl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * The contents of this file are subject to the Netscape Public
+ * License Version 1.1 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.mozilla.org/NPL/
+ *
+ * Software distributed under the License is distributed on an "AS
+ * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+ * implied. See the License for the specific language governing
+ * rights and limitations under the License.
+ *
+ * The Original Code is mozilla.org code.
+ *
+ * The Initial Developer of the Original Code is Netscape
+ * Communications Corporation.  Portions created by Netscape are
+ * Copyright (C) 1998 Netscape Communications Corporation. All
+ * Rights Reserved.
+ *
+ * Contributor(s): 
+ */
+
+#include "nsISupports.idl"
+
+[scriptable, uuid(f337b84a-1dd1-11b2-97c7-fb8b2e3f2280)]
+interface nsISubscribeListener : nsISupports {
+	void OnFinished();
+};