I am not aware of Class e3 airspace that is now associated in an area I used to be able to fly my ultralight, model airplane, or drone. It is now apparently requiring FAA authorization.
...Class E3 airspace areas are designated as arrival extensions to a Class C surface area. Class E arrival extensions are primarily designated to provide additional controlled airspace ancillary to a surface area to protect instrument operations for the primary airport, without imposing additional communications burdens on airspace users.
The meaning of E3 airspace is spelled out in several answers to this related question-- What are E2 and E4 airspace?