ezmlm-make -+ [changed_switches] dir
ezmlm-make(1) stores configuration info in DIR/config and uses that info as the default when you use the -+ switch. If the list was created with a very old version or ezmlm-0.53 ezmlm-make(1) you have to restate all arguments the first time you edit the list.
The -e switch works the same, without stickiness for switches.
A message arriving during reconfiguration may be handled incorrectly. The prudent user will set the sticky bit on the home directory to prevent delivery, then clear it after the list has been changed.