postfix was designed by one (that is very important) talented engineer - there is an excellent well-balanced architecture behind it along with professional impl

postfix was designed by one (that is very important) talented engineer - there is an excellent well-balanced architecture behind it along with professional implementation. It is much better to ask the author to make a special release with different licence and then import it. It is much better to reuse an excellent code of great projects like nginx, postfix or dovecot than [re]write it from scratch.