Marketing emails are often the backbone of a business and delivery of those emails is critical. There are a lot of email marketing companies that offer their services, but only a few that employ key protocols such as DMARC and DKIM to ensure delivery of your mailings.
Set up and configuration includes authenticating your domain, including the company you are sending through to DMARC (where applicable), creating default mailing lists, creating a registration page, and implementing the necessary DNS changes.