I am coming down with this problem too. Was working perfectly for about 4 weeks then aweber suddenly did not get updated with new customers, nor did the seller (and presumably) the buyer email go out either. This was since about Dec 1, and I am on Hostgator so presumably something happened there…
I changed the SMPT to my gmail account and all is flowing well…. except now my gmail account email gets subscribed to aweber instead of the buyer.
I tried to implement Startech’s solution – although the “eStore Settings Notification email address” says clearly “This is the email address where the seller will be notified of product sales”. Not sure why you would put in the aweber list name?
Anyway it did not work for me.
Anyone with any idea’s?