Class User

Gets the user's email address, if available. If security policies do not allow access to the user's email address, this method returns a blank string. The circumstances in which the email address is available vary: for example, the user's email address is not available in any context that allows a script to run without that user's authorization, like a simple onOpen(e) or onEdit(e) trigger, a custom function in Google Sheets, or a web app deployed to "execute as me" (that is, authorized by the developer instead of the user). However, these restrictions generally do not apply if the developer runs the script themselves or belongs to the same Google Workspace domain as the user.

// Log the email address of the person running the script.
Logger.log(Session.getActiveUser().getEmail());

Return

String — The user's email's address, or a blank string if security policies do not allow access to the user's email address.