Applications use **action mailer** to send and receive emails in ROR using mailer classes and views.


To send an email with the help of the action mailer, we can perform the following steps:

1. We have to set up a mailer with `rails generate mailer`.
2. We have to create the template for the email.
3. Tell the suitable controller to send the email.
4. Set the email preview.
5. Configure mail settings.



# Generate mailer

To generate a mailer we have to type the following command:

```r
tp> cd emails
emails> rails generate mailer UserMail
```


This command will create `UserMail.rb`.

Now, we add some functionality:

```r
class UserMail < ApplicationMailer
   default from: 'hr@educative.com'
   
   def welcome(user)
      @user = user
      @url  = 'http://www.educative.io'
      mail(to: @user.email, subject: 'Welcome to Educative')
   end
   
end

```

After this, we have to create a file named `welcome.html.erb`
in app/views/user_mailer/.

```html
<html>
   
   <head>
      <meta content = 'text/html; charset = UTF-8' http-equiv = 'Content-Type' />
   </head>
   
   <body>
      <h1>Welcome to Educative, <%= @user.name %></h1>
      
      <p>
         Your account is created successfully. Your username is : 
         <%= @user.login %>.<br>
      </p>
        
   </body>
</html>
```

The text part of the email is:

```txt
Welcome to Educative, <%= @user.name %

Your account is created successfully. Your username is :  <%= @user.login %>

```

In the place of  `<%= @user.name %` and  `<%= @user.login %>`, the actual name of the user is printed.

What is action mailer in ROR?

Applications use action mailer in ROR to send and receive emails through mailer classes, templates, and controllers.