You can modify any FastFax profile to allow that profile user to send documents for specific user(s) or all users. From a command line enter FFXMAIN and [Enter], take Option #2 to work with FastFax profiles. Take Option #2 to (Change) the profile and then option #2 for General Defaults.
This gives other individuals the authority to access the user profile’s resources such as Sending faxes, working with Outbound or Inbound faxes and working with Phonebooks, Notebooks and Attachment Books.This is mainly used when someone will be on vacation and needs another user to take care of their fax jobs for a limited time. If your case is that you need this ability all the time, then change your profile to have that authority.