Pelgrine Bulk Email Engine is a multithreaded bulk email engine with database and flatfile access features. PBEE has a built in template parser, and supports unlimited SMTP servers in a round robin, load balanicing fashion. 100% PureJava.
The specs sound like this will be a great project! I am very excited to try it out. But I have no idea how to even start it up, lol. Are there any resources that I can use or documentation in any way that I could take a peek at? I would love to look into this!