https://github.com/basecamp/mail_view/pull/71#discussion_r17883023

Author: costa

lib/mail_view.rb

@@ -100,10 +100,12 @@ def not_found(pass = false)
     def build_mail(name)
       mail = nil
       ActiveRecord::Base.transaction do
+
         mail = send(name)
+        Mail.inform_interceptors(mail) if defined? Mail
+
         raise ActiveRecord::Rollback
       end
-      Mail.inform_interceptors(mail) if defined? Mail
       mail
     end