diff --git a/lib/email/message_builder.rb b/lib/email/message_builder.rb
index 4be0c89a4ce..3a2a6b17568 100644
--- a/lib/email/message_builder.rb
+++ b/lib/email/message_builder.rb
@@ -139,6 +139,9 @@ module Email
       result['X-Discourse-Post-Id']  = @opts[:post_id].to_s  if @opts[:post_id]
       result['X-Discourse-Topic-Id'] = @opts[:topic_id].to_s if @opts[:topic_id]
 
+      # please, don't send us automatic responses...
+      result['X-Auto-Response-Suppress'] = 'All'
+
       if allow_reply_by_email?
         result['X-Discourse-Reply-Key'] = reply_key
         result['Reply-To'] = reply_by_email_address
diff --git a/spec/components/email/message_builder_spec.rb b/spec/components/email/message_builder_spec.rb
index 6b4c9f9a908..eec704c6054 100644
--- a/spec/components/email/message_builder_spec.rb
+++ b/spec/components/email/message_builder_spec.rb
@@ -26,6 +26,10 @@ describe Email::MessageBuilder do
     expect(builder.build_args[:charset]).to eq("UTF-8")
   end
 
+  it "ask politely not to receive automated responses" do
+    expect(header_args['X-Auto-Response-Suppress']).to eq("All")
+  end
+
   context "reply by email" do
 
     context "without allow_reply_by_email" do