One of the greatest supplements to any church's fund drive is a direct mail campaign, one of the least expensive and least labor intensive. With a few volunteers and the for the price of a stamp and an envelope, a large group of people can be reached.
There's an art to writing a fundraising letter that will get results, just as there's a proper way to explore religious grants and moneys for faith-based organizations. The following articles are useful starting points when considering fundraising campaigns.

