OpenBSD Develops Its Own SMTP Server
undeadly.org
undeadly.org
I will not use anything else for my internet-facing boxes.
I love the open-source developer mentality.
Would OpenSSH, pf, git, xorg, most "djbware", Samba, the *BSDs, or the entire GNU project exist if we didn't first have badly licensed software, badly designed software, real or imagined personal slights on mailing lists, etc.?
After all, the creative minds would still search for unsolved problems…
But kudos to them for going out and doing it anyway. I don't know if the world really needed one more MTA but it certainly won't hurt anyone.
So if your product is never going to be used/sold/shipped out side of USA, England, and a few other countries Public Domain is alright. Otherwise you need to use something like Creative Commons Zero License or a BSD/MIT License.
It is much better to reuse an excellent code of great projects like nginx, postfix or dovecot than [re]write it from scratch.
good luck with that.