Where do I set up a destination to be notified by email after I push it to the remote repository?

When pushing from the local repository to the remote repository, the mail is sent only to a specific user, not everyone who participates in the repository.
Everyone has the same notification level, so I don't know why some people send mail and others don't.
If you know any files or items on the GUI that specify who you want to email, please let us know.

GitLab 12.7.0
CentOS 7.6.1810 (Core)

An email notification (push information) was sent to the address specified in Sent mail to below.

Started POST"/api/v4/internal/allowed" for 127.0.0.1 at 2022-12-20 19:26:46+0900
Started POST "/api/v4/internal/allowed" for 127.0.0.1 at 2022-12-20 19:26:46+0900
Started POST"/api/v4/internal/pre_receive" for 127.0.0.1 at 2022-12-20 19:26:46 +0900
Started POST"/api/v4/internal/post_receive" for 127.0.0.1 at 2022-12-20 19:26:46+0900
Sent mail to [email protected] (36.2ms)
Sent mail to [email protected] (41.0ms)
Sent mail to [email protected] (22.0ms)
Sent mail to [email protected] (49.7ms)
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