To automatically accept postings from non-members:
Mailing lists are used to facilitate email communication within the campus community. Academic and administrative workgroups, student clubs and organizations, project groups and committees all use the service to create and manage lists and to send email to list members.
To see the admin settings for a list:
Yes. Use the Workgroup Integration page to link a workgroup that you administer to other Stanford Infrastructure Services, such as AFS, mailing lists, and Active Directory. When a workgroup is linked to another service, any change you make to the workgroup is automatically made to the linked service as well.