After the confusion that Postfix 2.10 is not Postfix 2.1, maybe it is time to change the release numbering scheme.
We could to the Linux thing where 2.mumble was followed by 3.mumble. or we could do it like Sun. After releasing Solaris 2.0 .. 2.6, they changed the numbering scheme with Solaris 7 which was released way back in 1998. Nowadays, many software distributions change the major release number frequently, if not every time. If we were to change the release numbering scheme like this with Postfix then we would immediately be free from the pain of getting sites to adopt Postfix 3.0, because they would no longer expect the pain of transitioning from Python 2->3, from perl 5->6 and the like. The next Postfix release would be 11.0, so 3.x would never happen. Wietse