admin/setting/userdefaultpreferences
From MoodleDocs
User default preferences allow a site administrator to specify the default values for some of the user profile options including:
- Email display
- Allow only other course members to see my email address [default]
- Hide my email address from everyone
- Allow everyone to see my email address
- Email format
- Pretty HTML format [default]
- Plain text format
- Email digest type
- No digest (single email per forum post) [default]
- Complete (daily email with full posts)
- Subjects (daily email with subjects only)
Forum auto-subscibe
Yes: when I post, subscibe me to that forum discussion
No: don't automatically subscibe me to forum discussions
Forum tracking
No: don't keep track of posts I have seen
[default]Yes: highlight new posts for me
[default]