Tiger JMail is a direct replacement for Sun's javamail, but with an LGPL license and fewer bugs. TJ works with both the Kaffe and Sun JVMs. It's tested, maintained, and in active use. TJ works well, but there's a lot of room for improvement.
[Intended Audience] Developers
[License] OSI Approved :: GNU Lesser General Public License (LGPL)
[Operating System] OS Independent
[Programming Language] Java
[Topic] Communications :: Email :: Email Clients (MUA), Communications :: Email :: Mail Transport Agents, Software Development :: Libraries :: Java Libraries