CentOS4.* 升级PHP，mysql等方法

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postfix-2.x.x-x.x.RHEL4.mysql_pgsql.centos4
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This is Postfix compiled with mysql and pgsql support so that you can use adatabase for both usernames and to hold mail.  If you need mysql supportfor your postfix mail server, you can upgrade a currently installedversion like this:

 yum --enablerepo=centosplus upgrade postfix*

or do an install like this:

yum --enablerepo=centosplus install postfix*

参考：http://mirror.centos.org/centos-4/4/centosplus/Readme.txt