I am applying for postdoc positions using the Mathjob website. I've noticed that some universities inquire if I've been in contact with faculty members in their departments. I applied for several of these positions and answered the question with 'no.' In such cases, do they reject my application? Should I contact a faculty member and express my interest in doing a postdoc under their supervision? Alternatively, is this question merely informational, with no response indicating that they will assign a random mentor?