It is standard procedure to send a message to acknowledge a candidate's application. Using your Applicant Tracking System's built-in email templates, you can effortlessly send a simple bulk rejection email to any job candidates you dismiss.
Applicants' interaction with the hiring team is limited before they meet with the hiring manager for a formal interview. As a result, it's unlikely that you'll need to personalize your rejection message. Send a quick email to inform them that they will not be proceeding. Tell them how long their resume will be kept on file and urge them to apply for future openings.