mailboxesForUser('alice'); assert_same(['info@example.com', 'sales@example.com'], array_column($mailboxes, 'email')); assert_same('alice', $dir->resolveRecipient('info@example.com')['owner'] ?? ''); assert_same(null, $dir->resolveRecipient('alias@example.com')); assert_same(null, $dir->resolveRecipient('missing@example.com')); });