We've made a slight adjustment to the Date Added timestamp in our Mailing List Admin screen:
https://www.e-junkie.com/ej/viewmailing_list.php
That timestamp now references when the buyer last purchased or repurchased the product or when the seller manually re-added them to that product's Buyer Group list, rather than the date the buyer first purchased that product (as heretofore). The buyer's original purchase date(s) will remain unaltered in your Transaction Log; this change only affects the Buyer Group mailing lists for our Newsletters & Updates service:
http://www.e-junkie.com/ej/help.updates.htm
This makes it more practical to use our Newsletters & Updates feature to distribute periodical files such as an online magazine or file updates for a limited term -- e.g., if you sell subscriptions on an annual pre-paid term, or include a year's worth of free file updates with an initial purchase, for which renewals may also be purchased, you can simply select the product in Mailing List Admin and manually remove buyers with a Date Added timestamp over a year old before sending out an Update batch.