Yes , AcyMailing is simply the best option for those who need a scalable newsletters system, powerful and easy to use. It is intuitive, in my opinion, I installed the trial version to show to my clients, people with no programming skills, and convinced them to quickly. To me it was a problem explaining to my clients how they should manage other components to create groups, import lists of emails, manage users and have the results statistics etc ... you know what I mean ;-).
I have finally found the component that makes life easier for me as web developer and also to my clients and users. I advise this one a try, there is a free version (great) and more complete versions of payment. The other positive aspect is the support team, five stars. I am happy now