FIX: Never mark emails sent to mailing list mirror as auto-generated

lib/email/receiver.rb

@@ -105,10 +105,10 @@ module Email
 
       raise NoBodyDetectedError if body.blank? && attachments.empty?
 
-      if is_auto_generated?
+      if is_auto_generated? && !sent_to_mailinglist_mirror?
         @incoming_email.update_columns(is_auto_generated: true)
 
-        if SiteSetting.block_auto_generated_emails? && !sent_to_mailinglist_mirror?
+        if SiteSetting.block_auto_generated_emails?
           raise AutoGeneratedEmailError
         end
       end

spec/components/email/receiver_spec.rb

@@ -808,6 +808,7 @@ describe Email::Receiver do
 
     it "should allow creating topic even when email is autogenerated" do
       expect { process(:mailinglist) }.to change { Topic.count }
+      expect(IncomingEmail.last.is_auto_generated).to eq(false)
     end
 
     it "should allow replying without reply key" do