From the dropdown menu, hover over List Configuration and click List Configuration Tasks.
Under Select List, choose the list you want to manage.
Click on the Security tab.
Scroll down to the Send= dropdown box. You can change it to any of the following:
Postmaster - not recommended; Only the postmaster (i.e. LISTSERV operations staff) can send to the list.
Private - Only people who are subscribed to the list may send mail or files to the list.
Editor - Only a pre-defined Editor (or Editors) can send mail or files to the list. Any messages sent by non-Editors will need to be approved by an Editor or Moderator before being distributed to list subscribers. Note that you must specify an Editor in the listserv configuration for this option to work.
Owner - Only the owners can send mail or files to the list.
Service - not recommended; Only people in the service area of the list can send to the list.
If desired, fill out the Special box. Email addresses in the Special box are exempt from the Send rule. For example, if only Owners are allowed to send to the listserv, you can put a non-owner in the Special box to enable them to send as well, without making them an owner.
Once you've set the desired send level, scroll to the bottom and click Save.