用postfix和dovecot搭过邮件服务器的大佬进来指点一下

配置完dns，systemctl restart named.service 重启后报错：
Jun 28 14:33:01 5b0e82aa7bbb named[271652]: network unreachable resolving './DNSKEY/IN': 2001:500:2f::f#53
Jun 28 14:33:01 5b0e82aa7bbb named[271652]: network unreachable resolving './NS/IN': 2001:500:2f::f#53