Vexatious request debate

An interesting debate has built up on the JISCmail discussion list about whether any email address or name can used by UK FOI requestors (e.g a request from Mickey.Mouse@hotmail.com) and how this may allow repeated or vexatious requests from one individual or group. Advice from the IC would point to public authorities having to take such addresses at face value.

Section 14 of the FOIA relates to vexatious requests.

Does anyone from outside the UK have any perspective on how their laws have operated related to this issue?