server code is part of the "mix" binary, but not yet fully usable.
(I'm still working on the server example configs, which are normally
generated using an automated process rather than being supplied in
example form and edited by hand.)
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From the README:
This program consists of
* a remailer client:
The remailer client supports sending anonymous mail using Cypherpunk
and Mixmaster remailers, managing pseudonyms at Newnym nym servers
and receiving mail anonymously from Cypherpunk remailers. It supports
OpenPGP encryption (compatible with PGP 2, PGP 5 and up, and GnuPG).
The client can be used with a menu-based user interface and with
command line options.
* a remailer:
The remailer supports the Cypherpunk and Mixmaster message formats.
It can be integrated with the mail delivery system of Unix-based
computers or use the POP3 and SMTP protocols for mail transfer.
Mixmaster includes an automated abuse-handling system.
