I would like to send an email if the user has send_mail preferences settings true.

Interceptor looks good for this. It works for localhost and testing env.

class TestingEmailInterceptor
  def self.delivering_email(message)
    message.to = message.to.map { |email| "test+#{email.split('@').first}@gmail.com" }
  end
end

The interceptor adds test words for emails. Like this: [email protected]

I would like to create two new interceptors. If users have send_mail preferences, I will send an email to them.

I don’t want to lose that interceptor setting. Rails initialized the interceptor like this.

if Rails.env.development? 
  ActionMailer::Base.register_interceptor(TestingEmailInterceptor)
end

I want to create two interceptors for production env. I have Store and Company models and they have relations with the User model.

What is the best practice for this?