We have a private portal where we allow all customers to share ideas, and we mask user names for confidentiality reasons. However the Comment notification email includes Commenter name in the body of the email and cannot be removed. Providing the ability to customize the body of email notifications would solve this issue.
This is currently possible by making the ideas portal anonymous. Usernames will show as "Guest" in the portal and emails when comments are made. Check out the blog post for more details.