Hello Wietse, thank you for your straightforward response. I was absolutely not advocating a change in the development model of Postfix, I have no reason to think that the current one as any problem. I was merely inquiring about the choice about the way the Postfix source code is distributed. I think that the use of a version control system, in a configuration where you are the only one with commit privileges, would be a nice way to have access to the source code and to follow its evolution.
Having to track the changes to Postix from version to version and to snapshot to snapshot, what I would do is to import each revision into a revision control system and compare them with the tools offered by it. If a central repository would be publicly available that task would be simplified. I think Mercurial, Git, and other distributed version control systems, have enough flexibility to be adapt to almost any workflow, while allowing to push nicely organized and easily to review changesets to a master repository. Cheers, -- Daniele