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diff --git a/comm/mailnews/base/src/nsMsgEnumerator.h b/comm/mailnews/base/src/nsMsgEnumerator.h
new file mode 100644
index 0000000000..306c3e3d72
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+++ b/comm/mailnews/base/src/nsMsgEnumerator.h
@@ -0,0 +1,45 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef _nsMsgEnumerator_H_
+#define _nsMsgEnumerator_H_
+
+#include "nsIMsgEnumerator.h"
+
+/**
+ * A base implementation nsIMsgEnumerator for stepping over an ordered set
+ * of nsIMsgDBHdr objects.
+ * This provides the javascript iterable protocol (to support for...of
+ * constructs), but getNext() and hasMoreElements() must be implemented by
+ * derived classes.
+ */
+class nsBaseMsgEnumerator : public nsIMsgEnumerator {
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIMSGENUMERATOR
+  nsBaseMsgEnumerator(){};
+
+ protected:
+  virtual ~nsBaseMsgEnumerator(){};
+};
+
+/**
+ * A base implementation nsIMsgThreadEnumerator for stepping over an ordered
+ * set of nsIMsgThread objects.
+ * This provides the javascript iterable protocol (to support for...of
+ * constructs), but getNext() and hasMoreElements() must be implemented by
+ * derived classes.
+ */
+class nsBaseMsgThreadEnumerator : public nsIMsgThreadEnumerator {
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIMSGTHREADENUMERATOR
+  nsBaseMsgThreadEnumerator(){};
+
+ protected:
+  virtual ~nsBaseMsgThreadEnumerator(){};
+};
+
+#endif /* _nsMsgEnumerator_H_ */