A monitoring apparatus and monitoringnotifying method for receiver and sender terminals of an e-mail transmission system having a receiver terminal can confirm a status of a receiver terminal, prior to a transmission. In one embodiment, an etch mask formed on a substrate includes a first aperture in a first photoresist layer and a second, larger aperture in an overlying second photoresist layer. hydraulic fracturing, may be re-used and re-cycled into components for subsequent use in a wide range of similar or different operational fluids. The filling device has a filling mandrel with a filling channel, from which the media feed channel extends in a separated manner.