Banning members

You can ban certain members or groups of members (i.e., names or domains) from joining or posting to the mailing list in Utilities: List Settings: New Subscriber Policy: Bans. For example, if you are "widget.com" and your competitor is "acme.com", you can ban anyone in the "acme.com" domain from joining. If these domains are already members, they will not be able to post to the list.

Note that this feature does not prevent administrators from adding banned members.