aardmail is a package with useful tools for different kinds of mail handling. Current programs include a POP3 client (can be used to replace fetchmail for getting mail from POP 3 servers), an SMTP client, a minimalistic sendmail, and a minimalistic client for testing. All programs support SSL for encryption, verification, and authentication. IPv6 works.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.