JONEICHORST  I have found this program does exactly what it states. It's a clean simple tool for mass mailing to client lists. A couple of nice improvements would include some basic back end reporting and a preview pane for your outgoing message. It does have subscribe and unsubscribe functionality, although I have yet to utilize it.

I only ran into one head scratcher that was easily remedied. In importing two delimited lists from the same source file, I found that the first imported as intended. The second seemed to experience some difficulty as it showed up null. Changing the text encoding option seemed to resolve the issue. I believe adding qualifiers on the data would also have resolved this. Having said that, the documentation made short work of finding possible remedies.

The best things it offers include ease of use, decent documentation, and stability. I am particularly pleased with how well it renders HTML email. It looks as intended across many clients/platforms... Mac Mail, Entourage, Outlook, gmail, even Lotus Notes.

I also really like the flexibility within the approach of enabling various combinations of messages and list to send to once I got acclimated withe the program, which took all of 15-20 minutes.

I'm sure some users will require more elaborate solutions, but if you are looking for a clean reliable mass mailing client that will take you from download to sending mail in very short order, this is a nice solution.  
(Version 2.6)