The best practices and other M3AAWG documents available in Japanese are below. Also see: M3AAWG に参加する意義. See all the M3AAWG documents for the industry.
Best Practices
In Japanese-Anti-Phishing Best Practices for ISPs and Mailbox Providers Version 2.01
ISP およびメールボックスプロバイダー向けフィッシング対策のベストプラクティス 第 2.01 版 2015 年 6 月 - Anti-Phishing Best Practices for ISPs and Mailbox Providers, Version 2.01, June 2015
In Japanese-M3AAWG Sender Best Common Practices Ver. 3.0
M3AAWG送信者のベストコモンプラクティス-M3AAWG Sender Best Common Practices, Version 3.0 Updated February 2015
In Japanese-M3AAWG Multifactor Authentication Recommendations
多要素認証に関するM3AAWG推奨 - M3AAWG Multifactor Authentication Recommendations (2017)
In Japanese-M3AAWG Password Managers Usage Recommendations
パスワードマネージャ利用に関するM3AAWG推奨 - M3AAWG Password Managers Usage Recommendations (March 2017)