Developing email templates to be sent by our Rails application may sometimes be a long and tedious operation because under development you must continuously send to yourself the email in order to test the changes.
If you don’t want to waste your time, Rails provides a very helpful tool for those who need to build the layout for the emails of our application: ActionMailer::Preview. In fact, with this tool (available from Rails 4.1), you are able to generate the Rails mailer view without the need to actually send the email.
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