1. whois

[Domain Name]                   F2FF.JP

[登録者名]                      株式会社ナノオプト・メディア
[Registrant]                    NANO OPT Media, Inc.

[Name Server]                   dns-t01.nlrs.jp
[Name Server]                   dns-t02.nlrs.jp
[Name Server]                   dns-t50.nlrs.jp
[Signing Key]                   

[登録年月日]                    2009/08/03
[有効期限]                      2024/08/31
[状態]                          Active
[ロック状態]                    DomainTransferLocked
[ロック状態]                    AgentChangeLocked
[最終更新]                      2023/11/12 08:06:07 (JST)

f2ff.jp.                14400   IN      TXT     "v=spf1 +a +mx +ip4:103.37.10.0/24 +ip4:118.238.221.10 +ip4:118.238.0.128/29 +ip4:160.16.103.66 +ip4:219.94.248.36 
+ip6:2403:3a00:202:1105:219:94:248:36 +ip4:202.208.196.167 
+a:mail.sansan.com 
+include:_spf.google.com 
+include:spf.curumeru.jp  
+include:mai" "lgun.org 
+include:24055967.spf10.hubspotemail.net  +ip6:2403:1f00:0:2:20c:29ff:fe60:8506 ~all"

DNS lookup count in your SPF record (12) exceeds the maximum limit of 10. 
This will result in a "permerror" and SPF authentication failure. 
Please use our EasySPF tool to optimize your SPF record and reduce the DNS lookup count.

2. history

f2ff.jp.                86400   IN      NS      dns-t02.nlrs.jp.
f2ff.jp.                86400   IN      NS      dns-t01.nlrs.jp.

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