DragonByte Newsletter lets you send an automated digest to users, containing the most popular threads from the last week. Users have powerful 1-click solutions for either reducing or increasing the frequency of your newsletter (Weekly, Bi-Monthly, Monthly, Quarterly, Bi-Yearly, Yearly), as well as an 1-click unsubscribe button.
The newsletter itself can be styled and re-coloured based on your forum's preferences by editing the simple HTML templates. By default, it styles itself to look like the Default Style included in every vBulletin installation.
The scheduled task ensures a limited amount of users are processed at a time, reducing server load and increasing the delivery rate of your newsletter.