qmail may be "ready" in the author's view, but that hasn't stopped the community from developing it further. Apart from the mentioned netqmail, there is also several swap-in components to take care of spam and virus filtering for example. qmail is very modular and it is easy to do this.
There is also qpsmtpd, which technically may be counted as anohter MTA, but which fits in nicely with the rest of qmail and is extremely flexible. It is written in Perl, performance is good enough on modern hardware.
I think you are being unfair to DJB, "wrong" is harsh. Yes, there is a problem, but not with the recommended configuration. He may be smug but the code is excellent. I wish all software was nearly as secure.
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