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Nginx [engine x] is an HTTP and reverse proxy server, as well as a mail proxy server, written by Igor Sysoev. It supports accelerated reverse proxying with caching, simple load balancing and fault tolerance, SSL and TLS SNI support, Name-based and IP-based virtual servers and lot more.
Baton is a simple proxy which accepts SMTP connections and routes them to one or more backend SMTP servers based on the envelope sender or recipients. The conversation is proxied in realtime without storing the mail content. There are no downloads but the code works - it is simple enough to be self-explanatory, especially with the test cases. Code derived from this project is used to implement the "fallback host" feature of the SubEtha mailing list server.