diff --git a/lib/email/receiver.rb b/lib/email/receiver.rb
index 73d468e4ac3..1d5a044d35f 100644
--- a/lib/email/receiver.rb
+++ b/lib/email/receiver.rb
@@ -383,7 +383,7 @@ module Email
         @mail[:subject].to_s[
           /\A\s*(Auto:|Automatic reply|Autosvar|Automatisk svar|Automatisch antwoord|Abwesenheitsnotiz|Risposta Non al computer|Automatisch antwoord|Auto Response|Respuesta automática|Fuori sede|Out of Office|Frånvaro|Réponse automatique)/i
         ] ||
-        @mail.header.to_s[
+        @mail.header.reject { |h| h.name.downcase == "x-auto-response-suppress" }.to_s[
           /auto[\-_]?(response|submitted|replied|reply|generated|respond)|holidayreply|machinegenerated/i
         ]
     end
diff --git a/spec/fixtures/emails/quirks_exchange_xars.eml b/spec/fixtures/emails/quirks_exchange_xars.eml
new file mode 100644
index 00000000000..16bd2d60e34
--- /dev/null
+++ b/spec/fixtures/emails/quirks_exchange_xars.eml
@@ -0,0 +1,10 @@
+Return-Path: <discourse@bar.com>
+From: Foo Bar <discourse@bar.com>
+To: reply+4f97315cc828096c9cb34c6f1a0d6fe8@bar.com
+Date: Fri, 15 Jan 2016 00:12:43 +0100
+Message-ID: <21@foo.bar.mail>
+Mime-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+X-Auto-Response-Suppress: DR, RN, NRN, OOF, AutoReply
+
+Some thing.
diff --git a/spec/lib/email/receiver_spec.rb b/spec/lib/email/receiver_spec.rb
index 99035646be8..4910880bc81 100644
--- a/spec/lib/email/receiver_spec.rb
+++ b/spec/lib/email/receiver_spec.rb
@@ -521,6 +521,10 @@ RSpec.describe Email::Receiver do
       expect { process(:invalid_from_2) }.to raise_error(Email::Receiver::NoSenderDetectedError)
     end
 
+    it "doesn't raise an AutoGeneratedEmailError due to an X-Auto-Response-Suppress header" do
+      expect { process(:quirks_exchange_xars) }.to change { topic.posts.count }
+    end
+
     it "doesn't raise an AutoGeneratedEmailError when the mail is auto generated but is allowlisted" do
       SiteSetting.auto_generated_allowlist = "foo@bar.com|discourse@bar.com"
       expect { process(:auto_generated_allowlisted) }.to change { topic.posts.count }