Hi. I think the best is major.minor.patch, with major being really ground breaking changes, or those that add major incompatibilities... e.g. getting rid of all kind of legacy config option names or such...
Minor being used for all other feature releases (which do not add major incompatibilities or greatly change the inner workings of postfix). Patch, ... any bugfixe releases... i.e. also for long term supported version. Jumping to 3 like in Linux made sense when the version numbering schema is changed. Cheers, Chris.
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