I should clarify I am not an admin and have no access/perms to fix this. However, running an automatic mail notifier can be difficult and time-consuming because of bounce/invalid-mail processing and the possibility of ending up on antispam blacklists. So *maybe* that's why this feature does not work. Also, I notice there is an issue-specific Atom feed for each issue. Perhaps following these feeds makes life easier? e.g. https://bugs.ruby-lang.org/issues/8741.atom