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Action Mailer Previews (since Rails 4.1)

Since Rails 4.1 there is a preview-function to see what an e-mail will look like.

All you need to do is implement a preview-class in spec/mailers/previews (if you are using RSpec):

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class NotifierPreview < ActionMailer::Preview
  def welcome
    Notifier.welcome(User.first)
  end
end

and then a preview will be available in the browser at http://localhost:3000/rails/mailers/notifier/welcome as well as a list of previews at http://localhost:3000/rails/mailers .

Note: If your preview model is not loaded you might need to change your application.rb:

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config.action_mailer.preview_path = "#{Rails.root}/spec/mailers/previews"

Rails <4.1

You could use Mailcatcher.

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Judith Roth