How to block email to certain email addresses or domain?

Question

We have an application built in rails 3.2.8. We are sending emails to customers. I want to block certain emails addressses. Basically mailer just ignore those particular email addresses.

For example: My company name is abc and I dont want to send emails to all my employees ie [email protected] or [email protected] ie *@abc.com

How can I do this?

PS: I am using sendgrid, they are not providing anything like this.

EDIT:

Placing this code in initializers directory:

 class EmailAddressFilter
  def self.delivering_email(message)
    message.perform_deliveries = false

  end
end

ActionMailer::Base.register_interceptor(EmailAddressFilter)

Should block all the emails. But still I can see emails in my development log.

PS: I have restarted my server.

Answer 1

In a file in config/initializers you can add something like this

class EmailAddressFilter
  def self.delivering_email(message)
    # permit or deny the message using its "to", "body" etc properties
    # note message.to is an array (multiple emails)
    message.perform_deliveries = Email.whitelisted?(message.to)
  end
end

ActionMailer::Base.register_interceptor(EmailAddressFilter)