WARNING: yum overwriting postfix (SOLVED!!) Having fought for many days to configure my perfect server, I found that the nightly yum update had overwritten my special (ie Falko) version of Postfix. To sort out the resulting problems I had to uninstall all versions of Postfix and reinstall from my locallly built RPM. I then had to uninstall ISPconfig3, delete the dbispconfig database and install ISPconfig3 again. Hopefully to prevent this happening again the solution is to edit /etc/yum.conf and in the [main] section add the line 'exclude="postfix"' so that yum doesn't try an upgrade agan. Has anyone had the same problem? Can anyone confirm this is correct?