(Without revealing too much...)
Why do you need a PC to receive these faxes?
We need to recieve certain documents from our people travelling and from there houses.

Why does the machine need to be part of the network?
It has to send the faxes by e-mail

Why does it need internet access?
Its going to be accessed through SSH or VPN by process owners from different locations of the world

How sensitive is the material that will be received by fax, who is going to need it and how often will they arrive?
Sensitive and we will be reciving very often.

Thank you for all the suggestions.