[CentOS] CentOS 5 and removing sendmail

[Joseph L. Casale]

>yum install postfix switch-mail
>switch-mail #change to postfix
>then you could probably remove sendmail (never tried)
>
>Craig

Am I correct in assuming the latest version of sendmail from the repo is 2.3.3-2? I was hoping to use 2.5 and wanted to install it via source.
Is it safe to install that way and run switch-mail after?

The other posts never mentioned switch-mail, is it ran by the system under certain scenarios?

Thanks!
jlc