Re: [cobalt-users] Qube 3 - How to stop spam?

[John Lee <johnvero@xxxxxxxxxxxxxx>]

Parker:

The access file is simple.

mydomain.com    RELAY
192.168    RELAY


Rgds
John

Parker Morse wrote:

> David Lucas replied to John Lee:
> > At 10:27 AM 11/13/2001, you wrote:
> >> I'd like to setup my qube 3 so that all incoming mails will be rejected
> >> unless
> >> they are destined for my domain/IP.
> >
> > Just how do you receive any email for anyone other than your domain/IP?
> > I would think that is impossible.
>
> No, back in the good old days before spam Mailer Agents accepted mail from
> anyone, for anyone. They sorted through it and sent anything not for them
> along to another machine. This was called "open relaying" and it was good.
>
> Then spammers started using any open relay they could find to take the load
> of their massive mailings, or to route around blocks on their own addresses.
> Now open relaying is considered a bad idea, which is why John is trying to
> close his.
>
> In a nutshell: firewalls aren't going to help, because the spam IS being
> sent to John's sendmail, with his IP address and everything. The incoming
> mail looks to the firewall like it's for him; the outgoing relayed mail
> looks to the firewall like it's from him. John needs to have his sendmail
> instead take anything not addressed to someone@xxxxxxxxxxxxxx, and bounce it
> (or just drop it on the floor). That needs to happen at the sendmail level,
> not at the firewall level.
>
> I've tried nearly everything I know, but it hasn't helped yet.
>
> John, the last thing I'd try is to cut down your "relay mail from" box (in
> the email server advanced settings) so it ONLY lists the domain of your
> Qube3: qube3.yourdomain.com (or whatever the full machine name is). In my
> case, that's bluebird.sinauer.com.
>
> If it doesn't work, please post the contents of your /etc/mail/access file
> (you can replace your domain with domain.com if you don't want to post the
> full address).
>
> pjm
>
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