JavaMail - Java library to build Mail and Messaging Applications

The JavaMail API is a set of abstract APIs that model a mail system. The API provides a platform independent and protocol independent framework to build Java technology based email client applications. The JavaMail API provides facilities for reading and sending email. Service providers implement particular protocols. Several service providers are included with the JavaMail API package; others are available separately.

The JavaMail reference implementation jar file, includes SMTP, IMAP, and POP3 protocol providers.