How to do a Newsletter with Javamail, using a Server Mail, such as, Postfix and Dovecot [closed]

view story

http://serverfault.com – I have currently set up in my Cloud Server - Rackspace, a server mail, using Postfix, Dovecot and Roundcube. The goal, is develop a Newsletter with Javamai, then to configure it for send multiples emails using the smtp set up from my server. The server mail is working fine. But, I have not ideia as to use the smtp of the server for the Javamail. Thanks you! (HowTos)