This document provides instructions for setting up and using eFax, an online fax service that allows users to send and receive faxes via email or online without needing a fax machine. It outlines the simple signup process, which involves choosing a phone number, filling out billing information, and sending colleagues the new eFax number. It also explains how to view incoming faxes attached to emails or in an online message center, and how to send faxes by selecting a file and destination number.