How to Add a Custom Domain to Your SUPPRESS Account
Overview
Custom Domains are domains (which you've purchased) that can be used to override the default Opt-Out Domain name provided with your SUPPRESS account. You can change domains at an account level, or override the domain being used by a specific Mailer, a group of Mailers or Opt-Out List.
A common use case for Custom Domains is assigning a Mailer or group of Mailers to their own Opt-Out Domain; this allows you to isolate the mailing activities of each partner, as to not affect others.
Add a Custom Opt-Out Domain, assign a Custom Opt-Out Domain to your account or Opt-Out Lists & Mailers.