In the case of a low traffic blog (for instance), that only accepts anonymous comments (no user registration) and manually validates them before publishing them, would it be possible to have a sort of internal white list for trusted email addresses (in the comment "email" field)?

The idea would be that comments using one of those addresses would be published immediately, without requiring validation.

(Obviously the email addresses of the commenters are not visible to the visitors.)

Is there a module for that?