Thank you for friendly welcome 
That's exactly what I fighting against and what I try to explain all the time.
Hopefully there will be a solution with Nethserver.
I tried a lot of distributions and SBS editions. Nethserver was the only one which survived more than 30 minutes
I think I will find some more enhancements which I need but the base is very good.
@davidep avidep: What can I do to have a persistent postfix config, until this feature is implemented, hopefully it will.