> I intend to upgrade Postfix version 2.5.5 to 2.7.1.
> Are there incompatibilities or specific path for upgrade ?
> Or any manual re-configuration to be done ?
> This server is a Debian Lenny and upgrade will be done via the Debian
> repository usage wich included Postfix v2.7.1.
Everything went fine doing an upgrade 2.5.5 to 2.7.1 via the Debian
Thanks to all for advices and attention.