Re: [Fwd: Re: Spamassasin over RBL, was Re: rblsmtpd -t?]
On Tue, 7 May 2002 22:44, cfm@maine.com wrote:
> Yes, and the only times we've been blacklisted was when our customers
> turned out to be running open relays on their shiny new NT boxes.
>
> Many cable modem systems provide static addresses. This gets really
> sticky, because lately we've been getting a lot of spam from them. The
> local abuse/postmaster@isp merely disclaims responsibility and forwards
> complaints to the operator. Just local here in Portland Maine there
> are some 3000 businesses on cable; as more and more of them start
> running their own SMTP servers and plugging in CDROM email databases
> this problem will mushroom. The damage a spammer can do from dialup
> is nothing compared to what he can do on a 2M cable connection with
> a linux box and powerful MTA.
The thing to do about this is to configure your outbound relays (which should
be separate from your inbound MX servers) to not accept a connection from
your clients if they are accepting connections on port 25.
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