US tend to call their professors by their surnames, in
Australia (and the UK) it is much more common to call your lecturer by their first name.“Hey Steve,” definitely doesn’t sound like the most formal way to start an email but your tutors will be expecting it so if they introduce themselves as Steve, that’s what you should call them. In many cultures, calling your superior by their first name can be seen as a lack of respect, but Aussies will find it totally normal. Aussie culture is pretty laid back so don’t stress about being extra casual.
