It looks like mailing list mode got turned on for everyone. You can turn it off in your preferences.
Dgraph forum admins:
I would recommend setting the default mailing list mode to off. I would also set the default email digest frequency to weekly. You can find these in the Admin->settings->User Preferences
Most of us prefer to get the digest emails weekly. This is one of the best features of discourse – the weekly digest emails – this allows us to easily keep up with a project community without being overwhelmed by notifications. Overall, I find that discourse is extremely well done, and feel it is one of the best ways for a community to communicate. @mr_rustbot how do you suggest using Github? Would you open an issue for every discussion thread?