> Is there a way to prevent unknow users or users within the list from
posting to
> this list?

Probably the easiest way would be to change your default options to:

* Default-Options= Review, Nopost

This prevents all subscribers from posting to the list.  You may also try
setting Send= to contain a literal email address:

*Send= [log in to unmask], Hold, Confirm

and also adding that email address to an Editor= keyword to trap any wayward
mail that manages to get in.  I'm not 100% sure but you might also be able
to put Send= Private to ensure no outside posters can get mail onto the
list.  I haven't tried that in combination with the other settings.

Finally, if you plan to implement something like this, make sure you hide
*any* keyword that contains an email address within a .HH ON and .HH OFF
block to prevent anyone from viewing it and attempting to spoof an email
from that address.

Example:

* XXX Distribution List
* Errors-To= Owner
* Subscription= Open
* Review= Owner
* Default-Options= Review, Nopost
* Ack= No
* Validate= No
* Auto-Delete= Yes,Full-Auto,Delay(5),Probe(30)

HH ON
* Owner= [log in to unmask]
* Editor= [log in to unmask]
* Send= [log in to unmask],Hold,Confirm

--
Chazzozz!!

Michael Shannon
Webmaster
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"Before you can grow old and wise you must first survive being young and
stupid." - Ancient Proverb

Note: Opinions expressed on this list are my own and do not reflect the
views, opinions or position of my employer.  If swallowed, seek medical
advice.