A lightweight email framework for Java web applications that need to send bulk emails to their users. Rather than your application objects calling the mail system directly, simply implement the Mailable interface and let the mailer call you instead.
Svarog is a real time web based call center which is based on AsteriskPBX, including technologies such as portlets, ajax (DWR/Dojo), jsf (MyFaces) and SpringFramework.
This project uses ICQ-style logic against a POP3 mailbox. Any incoming mail is checked against known users. Any not found can be either a) sent a "request authorization" form, b) ignored, or c) deleted.