On 01/20/2012 02:22 PM, Kalil Costa - Brasilsite wrote:
I think if block my clients authenticate on port 25 and leave only to
send and receive Internet mail, I could reduce spammers, virus coming
from my clients on port 25.
See this link http://www.antispam.br/admin/porta25/definicao/
My spanish is pretty much non-existant, but if I'm reading the diagram
correctly, what you want to do is to block port 25 traffic coming from
all of your clients (nothing to do with authentication really).
If you were to refuse authentication on port 25, I don't think that
would make much difference. Malware typically goes straight to port 25
with no authentication. This is why some ISPs block port 25 traffic (or
redirect it to their own smtp servers) in an effort to eliminate spam
coming from infected clients.
What you want to do is to block port 25 traffic that's coming from your
clients. This is typically implemented with firewall rules, provided you
can tell which IP addresses are your clients and which are not.
I think Tonino's post earlier was right on. Perhaps his spanish is
better than mine. ;) ?
--
-Eric 'shubes'
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