On 08 Jan 2015, at 13:35, Selcuk Yazar <selcuk.ya...@gmail.com> wrote:
> Our serve is redhat Red Hat Enterprise Linux Server (v. 6 for 64-bit x86_64), > so stil redhat have postfix 2.6.6 , > > i dont want to take this risk for updating running system. we have 60.000 > users and i'm just one people :) Postfix tends to be pretty much a drop-in replacement for older versions, so I wouldn't worry too much about the risk of upgrading Postfix itself. There's of course the software that may have an interaction with it, and that's something only you can judge. We have the latest Postfix 2.9.x on CentOS 6, compiled from source, because we need XCLIENT support for our setup. Reverting to the stock package is possible with a forced reinstall, but it hasn't been necessary. You can install it in parallel, test it on non-default ports, and then move the new version into production if there are no hickups. Careful planning is basically all it takes :-) Mvg, Joni
