Index: django/middleware/common.py
===================================================================
--- django/middleware/common.py	(revision 13402)
+++ django/middleware/common.py	(working copy)
@@ -82,7 +82,7 @@
     def process_response(self, request, response):
         "Check for a flat page (for 404s) and calculate the Etag, if needed."
         if response.status_code == 404:
-            if settings.SEND_BROKEN_LINK_EMAILS:
+            if settings.SEND_BROKEN_LINK_EMAILS and not settings.DEBUG:
                 # If the referrer was from an internal link or a non-search-engine site,
                 # send a note to the managers.
                 domain = request.get_host()