On Redhat/CentOS how many use a repository and how many build from source?

[francis picabia]

I'm not seeing any repository for Redhat Linux which is very current.
I'm accustomed to seeing security updates for my packages.

For awhile I made an exception, to get the latest Postfix
and build it from source since Postscreen was available as
a powerful new feature.

What do other Redhat admins use for amavisd repos or do you
build from source, or other option to maintain amavisd?