I intalled opendkim with sendmanil (on Ubuntu) without any problem, and followed the same procedure for installing on another server (Debian with postfix), but it does not work. Strangely, there is no error in the log files too.
In a GNU/Linux OS there is no way to change ownership of a file until you are root. But what if I want to hide my system’s username e.g. before sending a file to someone, because some things like tar will try to keep it?