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-rw-r--r--src/local/indirect.c94
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diff --git a/src/local/indirect.c b/src/local/indirect.c
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+/*++
+/* NAME
+/* indirect 3
+/* SUMMARY
+/* indirect delivery
+/* SYNOPSIS
+/* #include "local.h"
+/*
+/* void deliver_indirect(state)
+/* LOCAL_STATE state;
+/* char *recipient;
+/* DESCRIPTION
+/* deliver_indirect() delivers a message via the message
+/* forwarding service, with duplicate filtering up to a
+/* configurable number of recipients.
+/*
+/* Arguments:
+/* .IP state
+/* The attributes that specify the message, sender and more.
+/* A table with the results from expanding aliases or lists.
+/* CONFIGURATION VARIABLES
+/* duplicate_filter_limit, duplicate filter size limit
+/* DIAGNOSTICS
+/* The result is non-zero when the operation should be tried again.
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/* Wietse Venema
+/* IBM T.J. Watson Research
+/* P.O. Box 704
+/* Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <unistd.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <htable.h>
+
+/* Global library. */
+
+#include <mail_params.h>
+#include <bounce.h>
+#include <defer.h>
+#include <been_here.h>
+#include <sent.h>
+
+/* Application-specific. */
+
+#include "local.h"
+
+/* deliver_indirect - deliver mail via forwarding service */
+
+int deliver_indirect(LOCAL_STATE state)
+{
+
+ /*
+ * Suppress duplicate expansion results. Add some sugar to the name to
+ * avoid collisions with other duplicate filters. Allow the user to
+ * specify an upper bound on the size of the duplicate filter, so that we
+ * can handle huge mailing lists with millions of recipients.
+ */
+ if (msg_verbose)
+ msg_info("deliver_indirect: %s", state.msg_attr.rcpt.address);
+ if (been_here(state.dup_filter, "indirect %s",
+ state.msg_attr.rcpt.address))
+ return (0);
+
+ /*
+ * Don't forward a trace-only request.
+ */
+ if (DEL_REQ_TRACE_ONLY(state.request->flags)) {
+ dsb_simple(state.msg_attr.why, "2.0.0", "forwards to %s",
+ state.msg_attr.rcpt.address);
+ return (sent(BOUNCE_FLAGS(state.request), SENT_ATTR(state.msg_attr)));
+ }
+
+ /*
+ * Send the address to the forwarding service. Inherit the delivered
+ * attribute from the alias or from the .forward file owner.
+ */
+ if (forward_append(state.msg_attr)) {
+ dsb_simple(state.msg_attr.why, "4.3.0", "unable to forward message");
+ return (defer_append(BOUNCE_FLAGS(state.request),
+ BOUNCE_ATTR(state.msg_attr)));
+ }
+ return (0);
+}