Open Mailer

An Action Mailer delivery method that opens emails locally.

When delivering emails, they will be opened using your system’s default email client (e.g. Mail.app under macOS) without ever actually being sent.

Open Mailer has been tested with all currently supported versions of Rails, which includes 7.2, 8.0, and 8.1. It may work with older versions, too, but this has not been confirmed.

Add this line to your application's Gemfile:

bundle add open_mailer --group development

Then add the following line to the config/environments/development.rb file in a Rails app:

config.action_mailer.delivery_method = :open_mailer

The gem is available as open source under the terms of the MIT License.