A while back I settled on jfax as a service to get faxes. It’s free and it works. The main problem was that they want you to download their own viewer to view the faxes. The faxes are attached as .jfx files. After a little research I found that these are plain .tif files, and you can just rename the file from something.jfx to something.tif and then use any file viewer that supports tifs.
Hope this helps someone.