Re: [cobalt-developers] Preventing spam relaying on Qube3

[Malcolm McLeary <mmcleary@xxxxxxx>]

Hi James,

on 4/9/02 2:34 PM, James Nesbitt (IHQ Network) wrote:

> I am running a Qube3 and I have a have been notified that there are people
> relaying spam off me.
> 
> How do I set up an RDNS entry/entries to help prevent that, as well as
> whatever other effective methods of preventing spammers relaying off the
> Qube?

I can't say that I've ever had this problem, but I have email configured to
ONLY relay from machines in my LAN.  If you have remote users you can enable
POP before SMTP, but I prefer to just tell them to relay through whatever
ISP they are connected to.

It was my understanding that sendmail on a Qube3 was configured to only
accept email terminating on the Qube3 or being sent from implicitly allowed
address.

Having said that I have heard that the implementation of caching used on the
Qube3 is vulnerable to being used externally as a relay ... this could
actually be your problem.

Try disabling the Web Cache capability.

You could also installing a hardware firewall device between your Qube3 and
the internet.

Cheers,  Malcolm