When adding gifts in The Raiser's Edge, mark the Acknowledge status on the gift as 'Acknowledged' or 'Do Not Acknowledge.' This will prevent the gift from being eligible to be included in a Donor Acknowledgement Letter run regardless of any of your mailing parameters.

If you want to exclude gifts or constituents based on specific criteria:
  1. Create a query that excludes the gifts or constituents that you do not want to mail.
  2. Include the query on the General tab of the Donor Acknowledgement Letters.