Well, I know it's a very specific question or wish.
I use MadMimi as autoresponder. It's a simple but great service.
The only downside: There's no integration with eMember.
Should be very simple - if you know how. :-) And I have no idea. I only know that there is an API: http://madmimi.com/developer
What do you think? Is there a simple solution to integrate MadMimi?