In regards to the legitimacy of this letter, Zaheer Ali, an oral historian who served as the project manager and senior researcher of the Malcolm X Project at Columbia University, says it's likely this letter was actually written by Malcolm X.
"Based on everything I've seen, handwriting and context, I can confidently say that yes, this letter is his letter," he told the Huffington Post. 'The content is consistent, this isn't uncommon. He was very prolific."
Ali explained that the pilgrimage to Mecca had a profound effect on Malcolm X and that he often sent letters about it as a way to "broadcast" his message.
However, Ali doesn't believe this letter should be for sale. "I don’t think you can put a price tag on this," he explained. "Even though this is his personal correspondence, his intention was that this was to be made available to the public."
Regardless, Ali believes the letter's message, addressing race and religion, is particularly timely today.
"However this letter surfaced, it surfaced at the right time."http://www.huffingtonpost.com/entry/malcolm-x-letter-found-and-now-on-sale_5624ee2fe4b0bce347013f14