Just my 2c:Here: http://stevejenkins.com/blog/2011/01/building-postfix-2-8-on-rhel5-centos-5-from-source/ you can find directions to build Postfix from source, fully-compatible with CentOS Postfix packages.
The above process should be identical in RHEL 5.I have found that building/upgrading Postfix from source using the above directions is surprisingly easy and effective!
I have upgraded my production server to Postfix 2.8.0 and 2.8.1 successfully in this way.
You may want to try it. Nick On 9/3/2011 4:22 μμ, Katzir, Igal wrote:
A more educational experience will be getting the source and building my own package for redhat. (yum update doesn't work)
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