To do a "Mail Merge" for a printed set of letters:
From Groups:
1. Create a Group in iDONATEpro that you want to send mail to
2. Export the Group
3. In Word, setup mail Template for Letterhead, Thank you cards, etc.
4. Mail Merge in Columns / Fields
Use mail merge for bulk email, letters, labels, and envelopes
https://support.microsoft.com/en-us/office/use-mail-merge-for-bulk-email-letters-labels-and-envelopes-f488ed5b-b849-4c11-9cff-932c49474705#MergeBulk=Windows
Mail merge using an Excel spreadsheet
https://support.microsoft.com/en-us/office/mail-merge-using-an-excel-spreadsheet-858c7d7f-5cc0-4ba1-9a7b-0a948fa3d7d3