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My Mom sent in this comment.
From: My Mom
Date: 2007 Nov 11
Subj: unsolicited advice
In case you are interested: when we get a telephone solicitation I tell them we don't ever want their phone calls and will not give anything if they call again. I say it nicely since it is probably a well-meaning volunteer. We don't get another call. When we get too many paper requests in the mail, I have written something like "you sent 5 solicitations so far and are wasting resources. If you can not manage to limit your appeals to one a year I will send nothing in the future." This also works. If there are consequences, these places can change their behavior quickly.