This Fact Sheet specifies how individuals who receive malicious emails can view the email header information to discern the Internet Service Provider to contact and alert of the situation.
Hinduja, S. & Patchin, J. (2009). Cyberbullying fact sheet: Viewing email header information. Cyberbullying Research Center. Retrieved [insert date], from https://cyberbullying.org/viewing_cyberbullying_email_headers.pdf