Open relays and open proxies

Fri Apr 25 14:36:23 UTC 2003



--On Friday, April 25, 2003 4:31 PM +0200 Daniel Concepcion 
<dani at danielcp.net> wrote:

>> > I think that the end of the spam and open relays will be  when the smtp
>> > servers talk only with servers  with trust.
>>
>> Amazingly, even though I am posting in this thread... it is *not* about
>> spam.
>
> Uops, sorry for the mistake ;) But for me the spam is really a big
> problem  when use open proxys or relays or misconfigured smtp servers.
>
>> Don't be fooled by the mention of open relays.  Open proxies are abused
>> for many purposes, of which spam is a minor one.  I've seen open proxies
>> in recent DoS source addresses for example.
>
> The big problem in dDoS are the smurf, virus and trojans. Generally every
> machine infected have an open proxy. But the open proxy itself isn't
> dangerous. They are only use as intermediate hop for attack machines or
> control other trojans.

Sounds like you're arguing for widespread IP level blocking of open proxies 
then :)