No, they won’t know. Each mentee request is sent to up to 5 mentors who are a great fit. They won’t know who their request was sent to until/unless you send back a mentorship “offer” by accepting their request. This decreases the emotional burden on you as the mentor to say no to requests that aren’t the right fit for you. In addition, you won’t know who the mentee is until they accept your offer, as the requests are anonymized to control for unconscious bias and to allow the mentees to be more vulnerable in their requests without worry.