Hylafax actually runs on linux and turns a linux server into a full Fax machine, I set one up here and installed a windows printer on windows clients, a linux printer on the linux machines. The hylafax server itself sends out emails to different group boxes based on rules I set up. more info can be found on hylafax.org including configuration examples. like http://www.ifax.com/component/option...d,7/Itemid,97/
*edit, misread your message.
there should be a cups printer for hylafax which makes it avail to any app. but cant find it atm