```ruby
class NewsletterMailer < ActionMailer::Base

  
  layout 'email_html_layout'
  default from: "\"#{Settings.instance.smtp_sender_name}\" <#{Settings.instance.smtp_sender_email}>"

  
  def newsletter_new_features_email( user )
    @user = user
    @newsletter = "newsletter_features"
    mail(:to => @user.email, :subject => 'VersionEye Enterprise!') do |format|
      format.html{ render layout: 'email_html_layout' }
    end
  end


end
```

Update subject of newsletter email
user
```ruby
class NewsletterMailer < ActionMailer::Base

  
  layout 'email_html_layout'
  default from: "\"#{Settings.instance.smtp_sender_name}\" <#{Settings.instance.smtp_sender_email}>"

  
  def newsletter_new_features_email( user )
    @user = user
    @newsletter = "newsletter_features"
    mail(:to => @user.email, :subject => 'Biicode Integration') do |format|
      format.html{ render layout: 'email_html_layout' }
    end
  end


end
```
assistant