Normally you can find the buyer's email address in your E-junkie Transaction Log:
However, if you are selling on eBay, a problem cropped up at PayPal's end on Friday, which caused them to stop reporting buyer emails to our system, as we announced in our System Status & Updates forum here:
We have reported the problem to PayPal and are waiting on them to fix it. Unfortunately, we have no way to obtain the buyer's email address if PayPal neglects to report it to us, so without that email address we have no way to deliver the buyer's download link or code, as we would normally do automatically. The forum post linked above explains how you can obtain the link/code our system issued for the buyer's purchase, so you can send it to them manually.
