You will NOT get an acknowledgement letter for donations LESS than $250. You may still take advantage of your donation for tax purposes, but will need to keep a receipt of your donation to do so.
You WILL receive an acknowledgement letter from the North Georgia Community Foundation for donations of $250 or more, according to IRS policies.
From the IRS:
For a contribution of cash, check, or other monetary gift (regardless of amount), you must maintain as a record of the contribution a bank record or a written communication from the qualified organization containing the name of the organization, the date of the contribution, and the amount of the contribution. In addition to deducting your cash contributions, you generally can deduct the fair market value of any other property you donate to qualified organizations. See Publication 561, Determining the Value of Donated Property. For any contribution of $250 or more (including contributions of cash or property), you must obtain and keep in your records a contemporaneous written acknowledgment from the qualified organization indicating the amount of the cash and a description of any property contributed. The acknowledgment must say whether the organization provided any goods or services in exchange for the gift and, if so, must provide a description and a good faith estimate of the value of those goods or services. One document from the qualified organization may satisfy both the written communication requirement for monetary gifts and the contemporaneous written acknowledgment requirement for all contributions of $250 or more.