I created qmail-patches because vanilla qmail installation doesn't include many options needed in our time. Especially SMTP authorization, SSL. I had also my own ideas which I wanted to be implemented. This patch is set of patches available on qmail.org assembled into one piece.

What you get after applying this patch:

• qmail-smtpd checking addresses using special daemon,
• qmail-emtpd implementation of my EMTP protocol,
• mail from based relaying,
• ability to change qmail-queue to other program,
• tarpitting - dealying sender after issuing too many recipients,
• accepting mails for 0.0.0.0,
• checking number of recipients for bounced mails,
• SMTP authorization,
• SSL (at this time only when receiving mail by qmail-smtpd)

If you think that some future is missing you're welcome to add it or if you can't but think it should be implemented you can contact author.