>>You can also set the permissions for this particular person to NOPOST,
>> so they can receive the content of the list, but not contribute, if
>> that's what you are trying to achieve.
>
> Unfortunately, such measures only last as long as it takes for
> the interloper to change to a different email address.


Or, you could configure the list to initially put all new subscribers on
moderated status:

  Default-options= review

... then your problem poster (and all subsequent new subscribers) couldn't
post anything without your explicit approval.

Mike Yuhas
FOLKDJ-L
http://folkradio.org