Hi, I am trying to have ActionMailer raise exceptions with rails 2.3.2 but it does not. In development.rd I have config.action_mailer.raise_delivery_errors = true I tought it was due to a misconfiguration, so I modified deliver! in /usr/local/lib/ruby/gems/1.8/gems/actionmailer-2.3.2/lib/ action_mailer/base.rb to always raise any exceptions, but still no exceptions are raised. How to repeat: - create a new rails app with 2.3.2 - script/generate a new mailer with one method - configure development.rb: config.action_mailer.raise_delivery_errors = true - make sure that one method should raise an exception (i.e. wrong address) - call the method and... no exception is raised. Same thing on 2.2.2 raises the exception. Anyone with this problem?