Quoting Robert.Koepferl / de.gi-de.com:
> since I am on this list, I stay getting Viagra and Microsoft-Uptdate- spam.
> This wasn't the case bevore. As I found out, anyone can post to the list.
> So I think this is additional spam, we can easyly get rid of by rejecting
> mail from unknown senders.

Please look at http://www.ruby-doc.org/docs/ruby-doc-bundle/CLR-FAQ/clrFAQ.html
See the section 2.4.

It answers your question althought it does not solve the problem.

Regards,

Dalibor

-- 
Dalibor Sramek  http://www.insula.cz/dali  |  In the eyes of cats, 
                dalibor.sramek / insula.cz   |  all things belong to cats.