Email Spy

Get a peek at the emails your app is sending!

View project onGitHub


A simple gem that allows you to catch emails sent from your Rails app into your browser.

Based entirely on letter_opener, with pull requests, bug fixes, and real versioning.


Add this line to your application's Gemfile:

gem 'email_spy'

And then execute:

$ bundle

Or install it yourself as:

$ gem install email_spy


To start using email_spy simply add this line to your config/environments/development.rb file:

  config.action_mailer.delivery_method = :email_spy

That's it! Whenever your development mode application sends an email through action_mailer it'll open the default browser.


  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request


I give a huge amount of credit to Ryan Bates for building letter_opener. I grabbed his code, refactored the entire thing, added all the below contributors open pull requests, and fixed the bugs in the open bug list. Oh and I released it as the proper 1.* version it should be. Note: 95% of the pull requested code was entirely rewritten as well.