Two things that help ensure a receptive audience: saying thank you and employing personalization. For example, the handwritten card I received in April from my alma mater, San Diego State University:
Dear Mr. Neil Sagebiel,
Thank you so much for your donation to the College of Arts and Letters. Your support helps us out tremendously. It was a pleasure talking to you and go Aztecs!
Sincerely, Alexandra (Class of 2013)
I don’t know many people who reject thank you’s, or, for that matter, appreciation of any kind. As long they’re sincere and professional–and tied to action or sent at logical intervals–you can’t overdo thank you’s.
They are an important staple of every fundraising and marketing communications program.
Related: SDSU Student Caller Gets The Gift