Thank you for responding and posting what you did regarding unsolicited donations, @IndianaScott. While I've returned unopened packets to charities and called some requesting I be dropped from their mailing lists, I've not written them with my request. I will do that and appreciate the tip because the other ways tried did not work for me.

I do feel guilty that I simply can't donate to all but do also use the addr. labels and donate those "way-too-many-enclosed notepads".
Thx again for sharing your experience of working in nonprofits and how some closely track donor responses. New mantra for the day:
"Stop feeling guilty...Stop...." Thank you. Best to you for a sunny day today as well!