# Gemfile.rb
gem 'local_mail', :git => 'https://github.com/weih/local_mail.git', :group => [:development, :staging]
# config/routes.rb
Your::Application.routes.draw do
if Rails.env.development? or Rails.env.staging?
mount LocalMail::Engine, at: "/local_mail"
end
end
# config/environments/development.rb or config/environments/staging.rb
config.action_mailer.delivery_method = :local_mail
# Remember to start sidekiq or resque service if you're using async mail sending
# Email will be saved at tmp/local_mail folder