When a user account is locked the ability of emails to be able to be sent to the user should be disabled. This should be to prevent emails to be sent by users to the account, and it should disable any notifications from watchlists, or from personal notifications.
This is highlighted by the recent locking of accounts for people receiving global bans, and that they will be getting notifications drawing them back to the site.
@aklapper would you please add the stewards tracking ticket to this bug, I cannot work out how to do it. Thx