Does anyone know a good fax application, that I cam use using an email client?
I have FaxAway, that I used to use in my windows. It doesn't work with may Mac.
You don't need a separate fax program - the Mac can send and receive faxes by itself provided you have an internal or external modem. Connect the modem, go to System Preferences, Print and Fax, and add your modem as a fax. Set up preferences such as your phone number, receive options (answer after a number of rings, email/print/save the fax, etc). Then go to any application (Mail, Safari, Word), and use the Print command, then PDF - Fax PDF, to send a fax.