it's not possible to unsubscribe eMail notification for example:
Eos3-Open Beta-Bug Reporting
You can unsubscribe in two ways:
You can visit https://community.etcconnect.com/p/subscriptions and manage your subscriptions to forums.
You can also visit your user settings page and manage those and specific items as well: https://community.etcconnect.com/user/settings
Thanks @starksk. You explained very well.