Having a system seed list would be ideal as we used to have this with our old ESP and use it to notify our customer service team primarily of all the email promotions going out to our contacts so they can easily reference it should a customer call in referring to an email offer. We currently use an email group email to notify our internal teams to accomodate something similar to the Seed List functionality but are now running into issues with someone unsubscribing that email address since it is set up as a normal email contact and every so often, randomly noticing when we are not receiving the Seed Emails.