Let others send faxes through your Mac
You can use Printers & Scanners settings to let other Mac users on your local network send faxes through a multifunction printer connected to your Mac. The other Mac computers must be using macOS 10.5 or later.
On your Mac, choose Apple menu > System Settings, then click Printers & Scanners in the sidebar. (You may need to scroll down.)
Click the printer or scanner in the Printers list.
Select “Share this fax on the network,” then click Done.
If you can’t turn on sharing for this fax device, click Open Sharing Settings and turn on Printer Sharing.
Other users’ documents waiting to be faxed through your Mac are stored on your hard disk; that is, your Mac hosts the queue for the faxes.