Non-for-profit organizations run on donations, sponsors, and volunteers which can be difficult to constantly recruit. This is why non-profits use email marketing as one technique to reach out and share stories about the services they provide and how it impacts the people they are designed for. Once you volunteer your time or donate your money to an organization, they continue to email you because they know you are interested in the cause. This is similar to when a customer purchases an item from a company or brand online and they continue to email the interested consumer with information regarding deals and promotions related to their last purchase. Companies, brands, and non-profits know that they have you “hooked” even if it was just a one time purchase/donation. They now consider you a valuable contribution to their business.