Current Postfix RPMs?

[Matthew Valentino]

I'm new to Postfix, and I'm learning all I can from the readme files.
However, I'm using CentOS 5.5 and the repo contains v2.3 of postfix.
Building from source is causing strange problems with yum. Is there anywhere
I don't know about where I can find an RPM for a current version of Postfix?