Return e-mail address for automatic Product Key generation

Is there a way to set the "from:" e-mail address of the automatic Product Key email (i.e., in PaymentSettings.php somehow)?

Right now it's coming from some long complicated address, and I'd like something cleaner for my users to see.

We just use the mail() function in PaymentSettings.php. You can change the From, To, etc., fields to whatever you want.