I mostly give locally, and have had good luck limiting the reminders and mailings by simply asking that they stop. My local public radio/tv station is a good example of that. Having been on a not for profit board of a local chapter of one of the biggest national charities, I can tell you that the pressure to raise money is intense and never-ending. I often felt that we were employing less than ideal methods because of that pressure. If an organization you otherwise support has a practice that you find obnoxious or troublesome, I'd encourage you to share your thoughts with them. If it helps them figure out best practices, then you will be doing them a favor in the long run.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher