We just released 1.1.1 as a free update to existing users.  Notable new features include:

• Ability to work with large email accounts (~500k email accounts) regardless of PHP’s max_execution_time limit — it’ll pick up where it left off the next time it the cron script runs
• Added tooltips and reworked the delivery options to make it even more user-friendly
• Ability to send follow-up messages X days after you receive an email — perfect for sales letters

Have a feature request? Don’t hesitate to contact us.  Next up, CSV exports and a few enhancements to the core framework.