You should also check out the various product options at
http://www.electrasoft.com/ .Thus was a product that was selected for use for one of my clients some years ago.
Look at these four programs, they differ depending on your specific needs.
32bit InternetFax - Options include: Send faxes by fax modem, send faxes by email, send fax over the Internet, and the ability to forward all incoming fax to an email address. Single computer/modem/Network Optionally Send fax via the Internet using our built in fax API. If your fax recipient has an email address, this fax software program will fax email it to them by attaching the fax to an email and do an email fax to them.
FaxMail for Windows - Options include: Send faxes by fax modem, send faxes by email, send fax over the Internet, and the ability to forward all incoming fax to an email address. Single computer/modem/Network
32bit Fax - Options include: Send faxes by fax modem, send faxes by email, send fax over the Internet, and the ability to forward all incoming fax to an email address. Single computer/modem
32bit Email Broadcaster - emailing your newsletters and messages to thousands of groups and organizations in a few minutes from now with this full featured email newsletter system.
I think pricing is about $60, lifetime upgrades and support, a Top Pick from Cnet downloads which now carries Sesame.
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Another product, now free, but no longer being developed is 42BEEE, an email scheduler/broadcaster that I think can be sent to phone numbers as faxes:
http://www.iopus.com/freeware/beee/. I have not used this for over five years, but was effective and cost is right.