Initially eQmail was forked from netqmail by applying some patches and saving the sources separatily. The goal was to have a source code package available, which compiles out of the box on actual systems. Additional it should provide important functionality like TLS and authentication to make *qmail a suitable package. Not to forget full IPv6 support.
Since the first realease there were made some internal changes too. The most important one is the consolidation of 'qlibs'. It's an update of the original environment from djb, including changes he mentioned in some TODO files. The 'qlibs' are not part of the git repository, but included in the public eQmail releases (available as tgz' at ftp.dyndn.es). The qlibs are available through https://gitlab.com/kaili/qlibs as separate repository.
eQmail is positioned to be a modern but plain MTA. Advanced features will be provided by modules of the openqmail package (e.g. DKIM). Some more features are on the TODO list after all internals are consolidated to an equal level. As of its design it is simply to add additional functionality through plugins and/or wrappers. All the stuff - eQmail, qlibs and openqmail - is under heavy development so things will change.
See CHANGLOG* files for details. Additional info can be found at