Donor Acknowledgement Letters are designed to acknowledge a donor for a gift made in The Raiser's Edge. With Gifts of membership, the donor is the person who made the gift on behalf of the membership recipient.  We can reference the gift of membership recipient name in this mailing, but not their address.  So, we are not able to address the letter to the membership recipient using Mail, Donor Acknowledgement Letter.

Alternative Solution:

1.  Customize the letter in Export, selecting the necessary fields.

To include the name of the person who received a gift of membership when acknowledging gifts, refer to Knowledgebase Solution BB9059