Add the following lines to the appropriate
config.gem "inaction_mailer", :lib => 'inaction_mailer/force_load', :source => 'http://gemcutter.org'
As an extra step, for the sake of paranoia, you can check the delivery mechanism with:
./script/runner 'p ActionMailer::Base.delivery_method'
Now when you app send e-mails, it will deliver them to
Viewing your messages in a mail client
For this task, I kindly hand you over to popthis. It will serve your sent_mails folder as a pop3 account on your local machine.