Bypass comment validation for SOME anonymous users, based on the provided email address?
Make a rule with event after saving a new comment. Then make a view with the list of emails which should be bypassed. Compare this with the current email of the user, if there is a match publish the comment on the node.
The comparing can be done with views + vbo and the rules action: Load a list of entity objects from a VBO View.combined with a loop statement.