Hi

This might not be you are looking for but sendfax in mgetty is my
first choise to send FAX from linux box. As the name shows mgetty is
replacement of getty TTY control program and sendfax control modem to
send fax.

Another new and easy stuff is efax. I am not familiar with this.
please ask to Google for detail.

Ref. http://mgetty.greenie.net/
-- 
Norio Suzuki