Skip mailers while generating Rails 5 app

We can now skip requiring Action Mailer while generating Rails 5 app.

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2$ rails new my_app --skip-action-mailer
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4# OR
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6$ rails new my_app -M
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This comments out requiring action_mailer/railtie in application.rb.

It also omits mailer specific configurations such as config.action_mailer.raise_delivery_errors and config.action_mailer.perform_caching in production/development and config.action_mailer.delivery_method by default in test environment.

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2# application.rb
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4require "rails"
5require "active_model/railtie"
6require "active_job/railtie"
7require "active_record/railtie"
8require "action_controller/railtie"
9# require "action_mailer/railtie"
10require "action_view/railtie"
11require "action_cable/engine"
12require "sprockets/railtie"
13require "rails/test_unit/railtie"
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As, we can see action_mailer/railtie is commented out.