exim4 is unfortunately still SysV-only and doesn't ship a native systemd .service file. So the correct command is
"update-rc.d exim4 disable" "update-rc.d exim4 remove" will remove the symlinks in /etc/rc?.d/ but on the next package update, they will be recreated. So if you want to make this a permanent change, use "disable" man update-rc.d has a section "DISABLING INIT SCRIPT START LINKS" Regards, Michael
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