On Sun, 19 Jun 2005, Dean Anderson wrote: > > Neither open relays nor lack of email authentication are > problems that are exploited by spammers. Neither of those statements are true. I've already addressed the first. Regarding the second, we dealt with an incident last year where a spammer exploited an open proxy on our network to send spam; they evaded our port 25 block by using an unauthenticated outgoing SMTP relay. This attack was easy for us to stop because they discovered the relay by looking up our MX record; our MXs now handle incoming email only, and our outgoing relays have an obscure name which makes them difficult enough to discover that spammers don't bother. We are also moving our users to securely authenticated message submission so the relays can be more thoroughly locked down. Tony. -- f.a.n.finch <dot@xxxxxxxx> http://dotat.at/ BISCAY: WEST 5 OR 6 BECOMING VARIABLE 3 OR 4. SHOWERS AT FIRST. MODERATE OR GOOD. _______________________________________________ Ietf@xxxxxxxx https://www1.ietf.org/mailman/listinfo/ietf