That's because the first charity shared your contact information with other charities. One way to prevent that is by taking advantage of Charity Navigator's Giving Basket. This donation platform lets you, the donor, decide how much personal information you want to share with the charity - from your full contact information to none of it. Giving anonymously kills two birds with one stone - the charity itself can't pester you with endless appeals nor can it sell your contact information to others.
Join the more than 6,000 donors who, last year, gave over $7 million to 18,000 charities. Get started donating now!