What all language components will have to be used for implementing an email service system using java?
                +3 
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            Maybe look at Apache JAMES.
The Apache JAMES Project delivers a rich set of open source modules and libraries, written in Java, related to internet mail and news which build into an advanced enterprise mail server.
                  Thilo
                   2010-03-29 08:19:13
                
              
                +6 
                A: 
                
                
              
            If you want to implement an email server (SMTP, IMAP, POP3) - there is already Apache JAMES. It's open-source, so you can look into its sources if you insist on making one.
If you want to just send emails, having an already installed SMTP server, then use commons-email. It sits ontop of JavaMail and is very developer-friendly.
                  Bozho
                   2010-03-29 08:19:39