I have a database of 40 000 people and AcyMailing handled my whole list beautifully. Unlike some other components (which I used for 2 years and battled with for the last 12 months) the unsubscribe feature actually works and you can't add someone accidentally once they have been blacklisted. There is a bounce and cron function which works from within the component. You don't have to install any other components to get these features to work. The support is great too. Forget the rest AcyMailing is the best!!