Das Katerchen SMTP Server is a simple SMTP server for Linux platforms. It supports the mininum requirements of the RFC 2821 plus the following SMTP extensions: CHUNKING (RFC 1830), 8BITMIME (RFC 1652), and SIZE (RFC 1870).
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.