On this server, there is a contributor's area, that was previously maintained by registered developers and containing modifications/patches/improvements unapproved by the author if Ifmail.
Brian Sammon has written a document on installation and configuration of ifmail, IFMAIL HOWTO.
Ifmail v.3 development tree (probably *not* usable in real environment) is accessible (read-only) by CVS from the project page. Thanks to apparent lack of interest, this project is practically dead by now.
Ifmail is Open Source software, developed and copyrighted by Eugene G. Crosser.
There is a list of resources regarding Fidonet under UNIX at http://husky.phiscip.uni-stuttgart.de/.
Pablo Saratxaga maintains a derivate version if ifmail, ifmail-tx. It has some features (and some bugs) missing in the official version.
Ifcico program is capable of making outgoing calls over dialup serial lines and over TCP/IP connections, as well as accept incoming FidoNet calls, acting as an alternative to the login program (special getty program needed) and as an Internet daemon started by inetd.
Ifmail(ifnews) program convers RFC-0822 compatible mail messages and RFC-1036 compatible news articles into FTS-0001 compatible FidoNet packets, that later may be (optionally) compressed and sent by ifcico or any other BinkleyTerm compatible transport agent.
Iftoss program converts received FTS-0001 compatible packets into RFC-0822 compatible mail messages and RFC-1036 compatible news batches and passes them to appropriate mail and news agent programs (typically sendmail and rnews).
In cooperation with appropriately set up MTA and netnews packages, ifmail can feature an echo- and netmail distributing FidoNet hub.