FEATURE: Show an email icon beside posts that arrived via email

lib/email/receiver.rb

@@ -241,6 +241,9 @@ module Email
     end
 
     def create_post(user, options)
+      # Mark the reply as incoming via email
+      options[:via_email] = true
+
       creator = PostCreator.new(user, options)
       post = creator.create