https://x.com/bktr2021/status/1775485021857763780
1. whois
jcf.or.jp. 60 IN TXT "v=spf1 a:www4663m.sakura.ne.jp mx +ip4:58.80.52.137 +ip4:58.13.125.100 ~all" www4663m.sakura.ne.jp. 3600 IN A 49.212.78.63 jcf.or.jp. 3600 IN MX 10 jcf2013.sakura.ne.jp jcf2013.sakura.ne.jp. 3600 IN A 49.212.78.191