Rails mailer interceptor for DEV

Rails: DevelopmentMailInterceptor

# lib/development_mail_interceptor.rb
# copied from some RailsCast (could not remember the #...)
# expects a DEVELOPMENT_REDIRECT_EMAIL env var

class DevelopmentMailInterceptor 
  def self.delivering_email(message)
    message.subject = "#{message.to} #{message.subject}"
    message.to = ENV['DEVELOPMENT_REDIRECT_EMAIL']
  end
end

Rails: DevelopmentMailInterceptor initializer

# config/initializers/development_mail_interceptor.rb

if Rails.env.development?
  require 'development_mail_interceptor'
  Mail.register_interceptor(DevelopmentMailInterceptor)
end