Email forgery refers to a email address which has inaccurate information, although you won’t be able to edit this information if you use email services, on a program level we can tell exactly what to send to the email servers. Often the FROM can have a name, which name can be modified by anybody, this is often called spoofing and can this can trick the user into doing actions such as giving away their information, known as phishing.
There are also many frauds associated with forgery: Email fraud, Email hacking, Email Account Compromise (EAC), Business Email Compromise fraud (BEC).