@DramaMama2021, I agree. A letter was written. I think OP has to tell Clemson so they can check their files to see if it was received. What happens after that is out of her hands. Clemson can’t discuss a student with her because that would be a FERPA violation, so I don’t think they can tell her if it was received or ask her to prove who else might have written it. I think if it’s in this boy’s record he’s going to have to come up with a convincing explanation for how it came to be there. Even if he claims OP’s son is the author, if defies logic to think that a high school junior forged a letter from his mother and sent it without the other boy’s knowledge and consent.