From 6bace2c9053e8bdfc2689c3c92a9fc066d124401 Mon Sep 17 00:00:00 2001
From: Grex <grexaut@gmail.com>
Date: Wed, 17 Aug 2022 12:13:24 +0200
Subject: [PATCH] Add explicit DNS timeout

This makes DNS timeouts occur much more quickly and avoid clients with nonfunctional reverse DNS timing out while waiting for a response to their EHLO requests.
---
 lib/postal/smtp_server/client.rb | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/postal/smtp_server/client.rb b/lib/postal/smtp_server/client.rb
index 831b1054..be9f0743 100644
--- a/lib/postal/smtp_server/client.rb
+++ b/lib/postal/smtp_server/client.rb
@@ -105,7 +105,10 @@ def log(text)
       private
 
       def resolve_hostname
-        @hostname = Resolv.new.getname(@ip_address) rescue @ip_address
+        Resolv::DNS.open do |dns|
+          dns.timeouts = [10,5]
+          @hostname = dns.getname(@ip_address) rescue @ip_address
+        end
       end
 
       def proxy(data)