The JavaMail API is a set of abstract APIs that model a mail system. The JavaMail API provides a platform-independent and protocol-independent framework to build mail and messaging applications and provide facilities for reading and sending electronic messages. Service providers implement particular protocols. Using the API you can add email capabilities to your applications. JavaMail provides access from Java applications to Internet Message Access Protocol (IMAP) and Simple Mail Transfer Protocol (SMTP) capable mail servers on your network or the Internet. The API does not provide mail server functionality; you must have access to a mail server to use JavaMail.
The JavaMail API is implemented as an optional package in the Java platform and is also available as part of the Java EE platform.
To learn more about the JavaMail API, consult the JavaMail web site.