Since upgrading phabricator today, every user including people with imported accounts suddenly started getting notification emails from Phabricator about their commits, regardless of whether they touched any of our audit-triggering paths or herald rules.
In my opinion, it should be possible to import lots of users and not have them disturbed unless someone actively interacts with them through Phabricator (ie reviews, audit raised concerns, etc).
I could not find any way to globally disable this particular email notification, and with people pressing me to start the only solution I could find was to mysql-insert '{"mailtags":{"audit-commit":0}}' as a default user preference for everyone.