Protect yourself for ever accidentally sendmail emails from an environment other than production. MailRedirector lets you specify an email address to redirect all mail send by ActionMailer to. It also sets the X-Originally-To header to the original recipients, ensuring you can inspect to message and verify it would have gone to the correct recipients.
Gemfile gem 'mail-redirector', '~> 0.0.1'
install gem install mail-redirector