Re: [courier-users] breaking smtp

Gordon Messmer a =E9crit :
> Personally, I think transparency is a negative in this situation, since =

> valid users of your network have nothing to indicate that they can't =

> reach the mail servers that they are supposed to use, or why that would =

> be the case.
> =

Hi,

When allowing all computers to send mails directly, when a virus is =

spreading on the network, I wouldn't imagine the load of the entire system.
Viruses don't try to use the mail user agent and so, the configuration =

of it is not retrieved yet... They directly send mails.
So, for now, a simple firewall is needed. All mailservers can be =

configured to be smarthosts. All clients should use a valid SMTP server =

(through VPN or not)

To catch all zombies, just configure your firewall to log what you need. =

A batch could process logs and give you all your need to clean your network.

When zombies computers will behave like normal computers, we will look =

for another ways to block them.


HTH.
Jerome Blion.


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