Moxy is a transparent mail proxy. With Moxy, mail servers can listen for and receive mail on non standard ports, users retain complete control over their servers, no need to update DNS MX record with IP changes, bandwidth logged per domain or email
dproxy is a smart caching nameserver for use on gateway machines with
non-permenant connections. It includes support for PPP, Ethernet, ISDN and
DHCP connections.
This project intends to make a SOCKS compatible tunnel proxy which communicates to the server part, running on your nameserver, over standard DNS (UDP) protocol. That way you can bypass network firewalls allowing no other IP traffic but DNS.