In fetch criteria, ORs cannot be nested

Example: Fetching mail from a list of addresses, where FROM can be a@b.com, c@d.com, e@f.com.

Entering this as ['OR', ['a@b.com', 'c@d.com', 'e@f.com']] fails, as OR can only take two arguments.
Entering this as nested OR also fails in parsing it to a criterion string.

Is there another way to include ORed lists?
