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diff --git a/src/local_scan.c b/src/local_scan.c
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+++ b/src/local_scan.c
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+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* Copyright (c) University of Cambridge 1995 - 2009 */
+/* Copyright (c) The Exim Maintainers 2021 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+
+/******************************************************************************
+This file contains a template local_scan() function that just returns ACCEPT.
+If you want to implement your own version, you should copy this file to, say
+Local/local_scan.c, and edit the copy. To use your version instead of the
+default, you must set
+
+HAVE_LOCAL_SCAN=yes
+LOCAL_SCAN_SOURCE=Local/local_scan.c
+
+in your Local/Makefile. This makes it easy to copy your version for use with
+subsequent Exim releases.
+
+For a full description of the API to this function, see the Exim specification.
+******************************************************************************/
+
+
+/* This is the only Exim header that you should include. The effect of
+including any other Exim header is not defined, and may change from release to
+release. Use only the documented interface! */
+
+#include "local_scan.h"
+
+
+/* This is a "do-nothing" version of a local_scan() function. The arguments
+are:
+
+  fd             The file descriptor of the open -D file, which contains the
+                   body of the message. The file is open for reading and
+                   writing, but modifying it is dangerous and not recommended.
+
+  return_text    A pointer to an unsigned char* variable which you can set in
+                   order to return a text string. It is initialized to NULL.
+
+The return values of this function are:
+
+  LOCAL_SCAN_ACCEPT
+                 The message is to be accepted. The return_text argument is
+                   saved in $local_scan_data.
+
+  LOCAL_SCAN_REJECT
+                 The message is to be rejected. The returned text is used
+                   in the rejection message.
+
+  LOCAL_SCAN_TEMPREJECT
+                 This specifies a temporary rejection. The returned text
+                   is used in the rejection message.
+*/
+
+int
+local_scan(int fd, uschar **return_text)
+{
+return LOCAL_SCAN_ACCEPT;
+}
+
+/* End of local_scan.c */