RESOLUTION
A password for a mailing list can be changed with the following command:
$MAILMAN_ROOT_D/bin/change_pw --listname="LISTNAME" --password="NEWPASSWORD" See for more information:
$MAILMAN_ROOT_D/bin/change_pw --help $MAILMAN_ROOT_D/bin/change_pw --listname="LISTNAME" --password="NEWPASSWORD" $MAILMAN_ROOT_D/bin/change_pw --help