diff --git a/app/services/post_alerter.rb b/app/services/post_alerter.rb
index ba091af0a0a..da681499fb0 100644
--- a/app/services/post_alerter.rb
+++ b/app/services/post_alerter.rb
@@ -719,6 +719,13 @@ class PostAlerter
       # email to the user who was just added by CC. In this case the OP probably
       # replied and CC'd some people, and they are the only other topic users.
       return if post.incoming_email.cc_addresses_split.include?(to_address)
+
+      # We don't want to create an email storm if someone emails the group and
+      # CC's 50 support addresses from various places, which all then respond
+      # with auto-responders saying they have received our email. Any auto-generated
+      # emails should not propagate notifications to anyone else, not even
+      # the regular topic user notifications.
+      return email_addresses.dup.uniq if post.incoming_email.is_auto_generated?
     end
 
     # Send a single email using group SMTP settings to cut down on the
diff --git a/spec/services/post_alerter_spec.rb b/spec/services/post_alerter_spec.rb
index ebcfd4ef51c..ddc26a448be 100644
--- a/spec/services/post_alerter_spec.rb
+++ b/spec/services/post_alerter_spec.rb
@@ -1710,6 +1710,16 @@ describe PostAlerter do
       )
     end
 
+    it "does not send a group smtp email for anyone if the reply post originates from an incoming email that is auto generated" do
+      incoming_email_post = create_post_with_incoming
+      topic = incoming_email_post.topic
+      post = Fabricate(:post, topic: topic)
+      Fabricate(:incoming_email, post: post, topic: topic, is_auto_generated: true)
+      expect_not_enqueued_with(job: :group_smtp_email) do
+        expect { PostAlerter.new.after_save_post(post, true) }.to change { ActionMailer::Base.deliveries.size }.by(0)
+      end
+    end
+
     it "skips sending a notification email to the group and all other email addresses that are _not_ members of the group,
     sends a group_smtp_email instead" do
       NotificationEmailer.enable