To stop being automatically subscribed to card notifications when someone @mentions you or assigns you a card:
- Go to your personal board preferences by clicking your initials or avatar in the upper right of the board.
- Click User Profile.
- Under the My Board Preferences tab select "No, I don't want notifications."
This will stop you from being auto-subscribed to any additional cards.
Note: Users will receive the one-time email notification when another user assigns or @mentions a card to them, but users won't won’t receive further notifications about the card. This is not configurable.