From 1770760b73a2bcec6a9081f9578fd80de3cb1077 Mon Sep 17 00:00:00 2001
From: Vsevolod Stakhov <vsevolod@highsecure.ru>
Date: Sat, 17 Sep 2016 18:31:19 +0100
Subject: [PATCH] [Minor] Resolve A record if all MXes are absent

---
 src/plugins/lua/mx_check.lua | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/plugins/lua/mx_check.lua b/src/plugins/lua/mx_check.lua
index 637dfaec7..002ff46ab 100644
--- a/src/plugins/lua/mx_check.lua
+++ b/src/plugins/lua/mx_check.lua
@@ -139,10 +139,20 @@ local function mx_check(task)
   end
 
   local function mx_callback(resolver, to_resolve, results, err, _, authenticated)
+    local mxes = {}
     if err or not results then
+      local r = task:get_resolver()
+      -- XXX: maybe add ipv6?
+      -- fallback to implicit mx
+      mxes[mx_domain] = {checked = false, working = false, ips = {}}
+      r:resolve('a', {
+        name = mx_domain,
+        callback = gen_mx_a_callback(mx_domain, mxes),
+        task = task,
+        forced = true
+      })
       task:insert_result(settings.symbol_no_mx, 1.0)
     else
-      local mxes = {}
       table.sort(results, function(r1, r2)
         return r1['priority'] < r2['priority']
       end)
-- 
2.39.5