Unfortunately, not yet. But we do have an eye on the international market and would love to support faxing internationally.

It will work to send a fax to a US number from another country, right? I only need to send 2-3 faxes a year, and currently do it from a dial-up modem on an ancient computer over my US VoIP line that I have overseas. I very rarely need to receive faxes, so sending is all I'd need. This would really take the pain out of those occasional faxes!

Yes, you can send a fax to a US number no matter where you are located.

mbox.com.au had a great casual plan (pre-paid $10 and then just use as required)

I think they got acquired - I'm not sure what happened to the pre-paid deal... might be still there