I wrote that -owner address asking how I become a member:
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I thought I did sign up a long time ago and have been receiving the messages.
This is my first post.
What extra step do I do to be a member and not just receive the messages?
Thanks!
Sam
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and got this:

from: jamileh s.t." <xiaziyna@???>
to get gold membership post your credit card details and you will be
charged a small surcharge of $999/year

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original response from trying to post to the list I thought I am already
signed up for:

Your request to the unSYSTEM mailing list 
    Posting of your message titled "Re: [unSYSTEM] introducing a new
Distributed App: ?L?X?NDRI?" 
has been rejected by the list moderator.  The moderator gave the
following reason for rejecting your request: 

"Non-members are not allowed to post messages to this list. Sign up
and i'll be happy to approve the message. eden" 
Any questions or comments should be directed to the list administrator
at: 
    unsystem-owner@???