It would be very good and usefull. I also see it as extra security to send E-mail notification when money is used for something like a TIP or Buying soemthing on marketplace.
It also is security layer, in cae something happens with the wallet and money is transferred and your not inworld.
What the e-mail at least need to have i think
- Domain name where the wallet is used
- Amount of HFC
- For what it is used. TIP, GIFT, Marketplace.
That way you know what happens with your wallet when your not online. Also good to track what happens with your HFC.