You can create a suppression group containing constituents that have a specific domain in their email address. This suppression group would need to be used in all email deliveries. Follow these steps to identify the desired records.
  1. Create a Query
  2. Click the dropdown menu next to Field Type > select Email
  3. Click the dropdown menu next to Field > select Email
  4. Click Add Field Clause
  5. Next to Current Value, type in the desired domain
    • Example
  6. Click Save
  7. Click Save Query
  8. Click Run Query
  9. Use the Query results to create a Group
  10. Add the group to the "Do Not Email List" in the Audience section within your Email Campaigns to automatically add the group to each email delivery that takes place in the Email Campaign.