# ActionMailer (Ruby on Rails)

> Sending emails, mailers, layouts, attachments, delivery methods, testing emails

- 18 interview questions
- Mid-Level
- [Interview Questions: Ruby on Rails](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions.md)

## 1. Which command generates a new mailer in a Rails application?

**Answer**

The rails generate mailer command (or rails g mailer) creates a new mailer with the corresponding class in app/mailers, views in app/views, and test files. This command follows Rails conventions and automatically generates the file structure needed to send emails.

## 2. Which class must all mailers inherit from in a Rails application?

**Answer**

All Rails mailers inherit from ApplicationMailer, which itself inherits from ActionMailer::Base. ApplicationMailer is created by default in app/mailers and allows defining common configurations for all mailers in the application, such as the default layout or sender address.

## 3. In which directory are email view templates located in a Rails application?

**Answer**

Email view templates are located in app/views/mailer_name/. Each mailer method corresponds to a template (for example welcome_email.html.erb and welcome_email.text.erb). Rails automatically looks for templates matching the mailer method name.

## 15 more questions available

- Which method should be used to send an email asynchronously via ActiveJob?
- How to define the default sender address for all emails in a mailer?

Sign up for free: https://sharpskill.dev/en/login

## Other Ruby on Rails interview topics

- [Ruby Basics](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/ruby-basics.md): 25 questions, Junior
- [Ruby Object-Oriented Programming](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/ruby-oop.md): 20 questions, Junior
- [Rails Fundamentals](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/rails-fundamentals.md): 18 questions, Junior
- [Routing & Controllers](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/routing-controllers.md): 22 questions, Junior
- [ActiveRecord Basics](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/active-record-basics.md): 25 questions, Junior
- [Views & ERB Templates](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/views-erb-templates.md): 20 questions, Junior
- [ActiveRecord Associations](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/active-record-associations.md): 24 questions, Mid-Level
- [Advanced ActiveRecord Queries](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/active-record-queries.md): 28 questions, Mid-Level
- [Rails Forms](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/rails-forms.md): 20 questions, Mid-Level
- [Authentication & Authorization](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/authentication-authorization.md): 22 questions, Mid-Level
- [Modern Asset Pipeline & Frontend](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/rails-asset-pipeline.md): 18 questions, Mid-Level
- [Rails API Mode](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/rails-api-mode.md): 20 questions, Mid-Level
- [Testing with RSpec](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/rails-testing-rspec.md): 24 questions, Mid-Level
- [ActiveJob & Background Jobs](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/active-job-background-jobs.md): 20 questions, Mid-Level
- [ActionCable & WebSockets](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/action-cable-websockets.md): 18 questions, Mid-Level
- [ActiveStorage](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/active-storage.md): 20 questions, Mid-Level
- [Caching Strategies](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/caching-strategies.md): 20 questions, Mid-Level
- [Advanced Migrations](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/database-migrations-advanced.md): 20 questions, Mid-Level
- [Rails Engines & Modular Apps](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/rails-engines-modular-apps.md): 18 questions, Senior
- [Performance Optimization](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/performance-optimization.md): 26 questions, Senior
- [Rails Design Patterns](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/rails-design-patterns.md): 22 questions, Senior
- [Ruby Metaprogramming](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/ruby-metaprogramming.md): 20 questions, Senior
- [Rails Security](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/rails-security.md): 22 questions, Senior
- [GraphQL with Rails](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/graphql-rails.md): 20 questions, Senior
- [Deployment & Production](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/rails-deployment-production.md): 20 questions, Senior
- [Monitoring & Logging](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/monitoring-logging.md): 20 questions, Senior
- [Rails Upgrade Strategies](https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/rails-upgrade-strategies.md): 18 questions, Senior

---

Source: SharpSkill (https://sharpskill.dev), tech interview preparation for your real stack.
HTML version of this page: https://sharpskill.dev/en/technologies/ruby-on-rails/interview-questions/action-mailer