Remove spammy WP-Mail-SMTP submenus

remove-wp-mail-smtp-submenus.php

<?php
add_action( 'admin_menu', function() {
        remove_submenu_page( 'wp-mail-smtp', 'wp-mail-smtp-reports' );
        remove_submenu_page( 'wp-mail-smtp', 'wp-mail-smtp-logs' );
        remove_submenu_page( 'wp-mail-smtp', 'wp-mail-smtp-about' );
        remove_submenu_page( 'wp-mail-smtp', 'manage_options' );
        global $submenu;
        unset( $submenu['wp-mail-smtp'][5] );
}, 100 );