Change the From email and name

functions.php

add_filter( 'create_job_application_notification_headers','dm_job_application_headers', 10, 3 );
function dm_job_application_headers( $headers, $job_id, $application_id ) {
    $candidate_name  = get_the_title( $application_id );
    $candidate_email = get_post_meta( $application_id, '_candidate_email', true );
    $headers[] = 'From: ' . $candidate_name . ' <' . $candidate_email . '>';
    return $headers;
}