ora_mail is a tool for those of us who do not want to enable JServer for one reason or another. It is implemented as an external procedure that reads message data from CLOBS and passes it to and external program, such as qmail-inject or sendmail. There is also PL/SQL package that wraps arround this procedure to ease message creation.
Akeni Secure Messaging server is a secured client/server instant message solution for business. It supports standard messaging features such as chat, conference (group chat), notification, and file transfer, and a rich client. The Expert Edition also offers advanced enterprise IM features such as 128-bit encryption and server side message logging. Messages can be logged into a full searchable database or flat files for auditing purposes. The system also offers enterprise manageability through the use of shared folders and role-based user access rights.