A motley krewe of qmail contributors (see the README) has put together a netqmail-1.06 distribution of qmail. It is derived from Daniel Bernstein's qmail-1.03 plus bug fixes, a few feature enhancements, and some documentation.
We have done this because in our opinion, too many new users are confused by the out-of-date INSTALL file, and too much time is spent arguing on the mailing list over bugs. We have tried to stick to the barest minimum number of changes. We have fixed only those things which are out-and-out wrong, or which have been approved by djb (specifically QMAILQUEUE).
You can download netqmail 1.06. The MD5SUM for this file is c922f776140b2c83043a6195901c67d3. Older issues are still available.
Bill Shupp has put together a TLS + SMTP Auth patch specifically for netqmail-1.05 (should work fine for netqmail-1.06). Ted Fines has a patch which combines this with viruscan.