Should I address my professors by first name in emails if my peers are doing so already?
In the US-influenced culture of international Academica, closing an email with the first name can most of the time be interpreted as implicit invitation to interact, at least in further email communication, on a first-name basis.
So yes, most likely you can address your professors by first name in emails. Not because your peers are doing so, but because your professors are inviting you to. For other communication, I would just ask: &quot;Is it OK if I call you Jane, or do you prefer Dr. Doe&quot;?