Apt-get upgrade and Virtual Users + Domains With Postfix, Courier + MySQL
We have been succesfully running our mailserver based on the Virtual Users + Domains With Postfix, Courier + MySQL (+SMTP-AUTH, SpamA, ClamAV) howto. Im about to upgrade our system. Is there anything special I should know about the procedure? eg. Could apt-get upgrade mess up some configuration files? For example the quota system patched into postfix.
It's a production server so i would not like to mess it up :=)
Can I just run the command and expect everyting will work after the update?