On September 1, 2023, the JPO announced that it is developing a system and preparing related laws and regulations in preparation for the systemization of online document dispatch, which is scheduled to begin operating.
According to the revised Special Law, a specified notice, etc. sent online is deemed to have reached the applicant when 10 days have elapsed without the applicant receiving it, from the date when the applicant becomes able to receive it using Internet filing software, and the date of dispatch becomes fixed.

The future schedule is to release a system for submitting "Notification of Receipt of Specified Notification, etc." using the Internet filing software in December 2025, followed by the release of a system for the revised online dispatch system in March 2026.

Japan Patent Office
https://www.jpo.go.jp/system/laws/sesaku/tetsuzuki/online-hasso_minaoshi.html