Seems I accidentally sent my previous reply to Simon directly; sorry
about that. In any case

On Wed, Jan 15, 2014 at 12:30 PM, Simon Kelley <si...@thekelleys.org.uk> wrote:
> There's a (very old) patch in contrib/try-all-ns that would make a starting 
> point

This does not apply against trunk, so I tried to rework it. The
following appears to do what I expect:

diff --git a/src/forward.c b/src/forward.c
index 8167229..76070b5 100644
--- a/src/forward.c
+++ b/src/forward.c
@@ -610,7 +610,11 @@ void reply_query(int fd, int family, time_t now)

   if ((RCODE(header) == SERVFAIL || RCODE(header) == REFUSED) &&
       !option_bool(OPT_ORDER) &&
-      forward->forwardall == 0)
+      forward->forwardall == 0 ||
+      /* try each in turn */
+      RCODE(header) == NXDOMAIN &&
+      option_bool(OPT_ORDER) &&
+      server->next != NULL)
     /* for broken servers, attempt to send to another one. */
     {
       unsigned char *pheader;

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