Fax confirmation for faxes sent via email?

Yes! For sure via the email confirmation - and I just tested it and it worked. :-) 

I thought so, but this got strange now.  My first attempt showed no response (positive or negative) and nothing in the desktop app to match.  So then I added my email address to outbound fax section under my user settings even though it is the same email as my account and I assumed I didn't need it. So I tried again and this time I saw in my desktop app that the fax was sent, but also received this email:

When we tried to send your fax, our system detected that you have multiple accounts with the same trusted email address.  Your fax could not be sent because we were not able to determine which account to use.

Please log into the accounts that you do intend to send faxes from and remove your email address from the trusted list by clicking Preferences and then Fax Settings.

So now I am not sure if my fax went or not and unfortunately can't call anyone on the receiving end to check in this case..