How to upgrade postfix 2.3.x.x to 2.9.x.x in CentOS 5.8
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I provided you a link to some RPMs for EL5 which should work. others are available too if you google around, i think i saw some on the russian centalt repo. these are not *official* rpms but should work fine. you are welcome to upgrade from source if you wish, nothing stopping you but unless you are aware of a specific reason to do it, why would you?
well that is no reason to do any form of upgrade. if you are not after specific functionality, then you should stick with the official packages, which are much more likely to have had any bugs or security issues fixed in them by the commercial vendors.
downloading the rpm from the source??? what does that mean?
No, that's not the way it works. if you have no knowledge of needing to upgrade, it is pointless, and will leave you with a probably less secure / reliable system. Redhat continue to make security updates to the older software long after it's officially replaced by newer versions of code from the original postfix developers.