1. On the General tab of the donor acknowledgement letters or receipts, mark the Create output query checkbox. This will prompt you to save a static query once the letters are exported or merged.Create Constituent Output Query
  2. Create Envelopes or Labels from the Mail page
  3. On the General tab, click Include> Selected Records  
  4. Choose the output query from Step 1
  5. On the Format tab, select Sort on the left, select Sort by the following field and double-click to move Query from the Available Fields to the Sort Fields section. This will allow the labels or envelopes to sort automatically in the same order as the output query from the acknowledgement letters or receipts.User-added image