In Professional edition you can send unlimited messages in Direct Mode (built-in SMTP), via your SMTP servers, Socks servers and Webscript. Also can use Bounce Manager, Mail Merge, Opt In/Out service, List Tools and External Datasourses.

Here you can read help - Manual, see video, how use program - Video Tutorials and download free version - Download

You pay one time for lifetime key for one PC and unlimited emails. Also you have free support and update of program in current version.