It's not even the content of the mailings (I don't read them anyway, I learn about charities from their own websites, news stories, IRS 990s and charity rating sites), it's the volume that gets to me. I know I should be supporting the Post Office, but I just hate getting the annual reports that weigh two or three pounds. We've had moderate success with enclosing a note with our check, asking them not to send any paper mail. But maybe that only ever works with larger donations. I don't find any difference as far as local vs. national vs. international, except for the super tiny local organizations that just don't send any mass mailings at all.