I used the "milter-protocol.txt" file that I found everywhere. It is for protocol version 2 only. So I based my implementation on that.
Later on, I used archive.org to download a copy of libmilter-docs.tar.gz. I expected the documentation to explain the differences between versions (eg going from v2 to v3, then v3 to v4, etc) but it does not have information about the different versions. So far, it is not clear to me, what features come with each version. On Wed, 14 Dec 2022 00:01:13 +0100 Jean-François Bachelet <jfbache...@free.fr> wrote: > did you find the libmilter-docs.tar.gz that was on the milter.org site > or did you used infos from the sendmail opensource ? > > Jeff