Network Faxing Solution

Clarifications

I've been using this for years and it works great:
http://www.esker.com/products/fax_software_unix.asp

working on a project deploying netsatisFAXion (http://www.faxback.com)

Been using Esker Fax for years.
Hint: keep it simple, nobody uses all the bells and whistles anyway.

This is the old CA FAXServe product.

http://www.2point.com/FAXserve/FSWin.asp

This product has been around for years. It is simple and can use almost any dial-up faxmodem as well as Brooktrout and Digi modems.

Been supporting and using the server for about 3 years now and its a solid performer with to little issues to mention.

www.rightfax.com

I use Popfax.com internet fax service and it's the most convenient one for me. You can try their Free Trial, it doesn't need to write you credit card nr. Their service is very cheap and fast.