Add a filter for bring shipping rates to exclude mail box services if a shipping class is present in the cart

bring-filter-no-mailbox-shipping-class.php

<?php

/**
 * Filter the bring shipping rates.
 */
add_filter('bring_shipping_rates', function( $rates ) {
	$shipping_classes = [
		'no-mailbox',
	];

	// Look for items with a shipping class that doesn not allow mail.
	$items = array_filter(
		WC()->cart->get_cart(),
		fn($item) => !empty($item['data']) &&
			in_array($item['data']->get_shipping_class(), $shipping_classes)
	);

	if (empty($items)) {
		return $rates;
	}

	$remove_rates = [
		'3584',
		'3570',
	];

	return array_filter(
		$rates,
		fn($rate) => empty($rate['bring_product']) ||
			! in_array($rate['bring_product'], $remove_rates)
	);
}, 999 );