ispconfig change remote mailserver by itself

[spazio]

The version installed is 2.3.1. on a debian box. I know i just realised that it's the dev version. First thing first, is there a way to upgrate to the production version 2.2.15 or is it best to stick to 2.3.2-dev?

The serveur changed all domain from local mailserver to remote mailserver by itself last night! The change was in the options of the site and in the domain alias as well. The result being the removal of all informations in the 2 following files.
/etc/postfix/virtualusertable and
/etc/postfix/local-host-names

Naturally, the effect of those changes being the reject of all incomming mail

Any idea of what happened? And is there a way to prevent this in the futur?

Thanks in advance for anyhelp...