On Sequoia, I want to configure my postfix as a server. And for this I have to change the way postfix is started from:
/System/Library/LaunchDaemons/com.apple.postfix.master.plist
But this file is on the read only / file system.
Then I just unloaded this startup, and made a new one in:
/Library/LaunchDaemons/com.apple.postfix.master.plist
and I was able to start it.
But on the next system boot, the system one in
/System/Library/LaunchDaemons
was started again.
How should I cleanly and permanently achieve this server basic modification?