Restrict Member Options
This setting determines whether your members are allowed to set their various member options.
By default, members are allowed set options such as whether they want to receive a digest version of the mailing list, whether to receive an acknowledgement when posting, and other things.
On an announcement list, these member options often do not apply. For instance, if you are sending out one announcement per week, it does not make sense for members to be able to set their membership
to receive a daily digest.
In such a case, you may want to disable the member's ability to set their own options. The options will no longer appear in the web interface for joining and "your settings", and email commands to
set them will be rejected.