Sun's posted a beta of JavaMail 1.3.3. JavaMail is a basic library for performing POP, SMTP, and IMAP. I wrote about this in the final chapter of Java Network Programming. Accpording to Sun, the "1.3.3 Early Access release contains over 20 bug fixes and enhancements, including support for more protocol-specific features and significant performance enhancements for base64 encoding and decoding."