On Sat, Sep 11, 2021 at 08:22:46PM +0100, Nick Howitt wrote: > I interpreted this, perhaps mistakenly, as if this were now the running > config of postfix.
There is no such thing as "the running config of Postfix". There's just main.cf, master.cf and various processes that have at some point in the past read those files. The postconf(1) program does not query the non-existent "running config of Postfix", just like any other Postfix program, it just uses what it finds in main.cf and/or master.cf when it loads those files. > It does not update main.cf, just the current running config and a > reload would get you back to the values in main.cf. I was > then trying to leverage this understanding. There is no "running config". Setting "-o" options in postconf affects only that one executation of postconf(1) and nothing else. So it is generally rather pointless. -- Viktor.