What's this 'Antispam UOL'

[Rahul Sundaram]

Parameshwara Bhat wrote:

> Dear List,
>
> Nowadays I regularly recive replies to my postings from 'AntiSpam UOL  
> <petsupermarket.sspam at uol.com.br>'.Though there appears to be 
> discussions  on this on the list,having not followed from the 
> beginning,I could not  make any sense of it.
>
> If the full header is listed,message seems to go from one shadow5 to  
> uol.com.br whose antispam returns the message.Produced below.
>
>     Received:     from shadow5 (unknown [172.26.5.186]) by 
> sauron6.uol.com.br  (Postfix) with ESMTP id BECC26C2261 for 
> <peebhat at gmail.com>; Tue, 7 Mar  2006 04:46:39 -0300 (BRT)
>
> Who is this shadow5 (172.26.5.185)?How my message went to this 
> server?  From gmail SMTP or fedora-list server? or from my ISP on the 
> way?
>
> Thanks a lot.
>
> Parameshwara Bhat
>
Very detailed description of this issue is available at  
http://fedoraproject.org/wiki/UOL linked from 
http://fedoraproject.org/wiki/Communicate.

-- 
Rahul