FIX: Don't send rejection mailer to bounced emails.

lib/email/message_builder.rb

@@ -17,6 +17,9 @@ module Email
   class MessageBuilder
     attr_reader :template_args
 
+    REPLY_TO_AUTO_GENERATED_HEADER_KEY = "X-Discourse-Reply-to-Auto-Generated".freeze
+    REPLY_TO_AUTO_GENERATED_HEADER_VALUE = "marked".freeze
+
     def initialize(to, opts=nil)
       @to = to
       @opts = opts || {}
@@ -132,7 +135,11 @@ module Email
     def header_args
       result = {}
       if @opts[:add_unsubscribe_link]
-        result['List-Unsubscribe'] = "<#{template_args[:user_preferences_url]}>" if @opts[:add_unsubscribe_link]
+        result['List-Unsubscribe'] = "<#{template_args[:user_preferences_url]}>"
+      end
+
+      if @opts[:mark_as_reply_to_auto_generated]
+        result[REPLY_TO_AUTO_GENERATED_HEADER_KEY] = REPLY_TO_AUTO_GENERATED_HEADER_VALUE
       end
 
       result['X-Discourse-Post-Id'] = @opts[:post_id].to_s if @opts[:post_id]

lib/email/receiver.rb

@@ -12,6 +12,8 @@ module Email
     class EmptyEmailError             < ProcessingError; end
     class UserNotFoundError           < ProcessingError; end
     class AutoGeneratedEmailError     < ProcessingError; end
+    class AutoGeneratedEmailReplyError < ProcessingError; end
+    class BouncedEmailError           < ProcessingError; end
     class NoBodyDetectedError         < ProcessingError; end
     class InactiveUserError           < ProcessingError; end
     class BlockedUserError            < ProcessingError; end
@@ -62,6 +64,8 @@ module Email
       body, @elided = select_body
       body ||= ""
 
+      raise BouncedEmailError if (@mail.bounced? && !@mail.retryable?)
+      raise AutoGeneratedEmailReplyError if check_reply_to_auto_generated_header
       raise AutoGeneratedEmailError if is_auto_generated?
       raise NoBodyDetectedError     if body.blank? && !@mail.has_attachments?
       raise InactiveUserError       if !user.active && !user.staged
@@ -422,6 +426,20 @@ module Email
       !topic.topic_allowed_groups.where("group_id IN (SELECT group_id FROM group_users WHERE user_id = ?)", user.id).exists?
     end
 
+    private
+
+    def check_reply_to_auto_generated_header
+      headers = Mail::Header.new(@mail.body.to_s.gsub("\r\n\r\n", "\r\n")).to_a
+
+      index = headers.find_index do |f|
+        f.name == Email::MessageBuilder::REPLY_TO_AUTO_GENERATED_HEADER_KEY
+      end
+
+      if index
+        headers[index].value == Email::MessageBuilder::REPLY_TO_AUTO_GENERATED_HEADER_VALUE
+      end
+    end
+
   end
 
 end