Re: ***SPAM*** Re: Massive SPAM Increase {-2.6} {-2.6}

["Jamie Riden" <jamesr () europe com>]

On 14/10/06, Paul Schmehl <pauls () utdallas edu> wrote:
> --On October 13, 2006 10:46:34 PM -0400 Valdis.Kletnieks () vt edu wrote:
>
> > On Mon, 09 Oct 2006 13:33:12 CDT, Paul Schmehl said:
> >
> > (Digging out from a long week of other stuff, sorry for the late
> > response)
> >
> >> Its purpose is to reject *all* mail from bogus MTAs - dialups,
> >> misconifigured servers, MTAs that aren't registered in the domains' DNS
> >> as a "legal" MX, MTAs that don't reverse properly, etc., etc.  If the
> >> email is
> >
> > "mta that aren't registered in the DNS as a "legal" MX" - tell me Paul,
> > how does that work with any site that's big enough that they run split
> > inbound MX and outbound servers?
> >
> Send me an email at geek () stovebolt com, and I'll tell you.
>
> I'm not sure what you mean by "split inbound and outbound", but any
> outbound MX host *should* be listed in DNS.  You only list one -
> smtp.vt.edu.  192.82.162.213 is reversible, so it would get points for
> being honest about its IP/hostname, but it would lose points for not being
> listed in DNS as an MX.  The overall score would determine if the mail was
> rejected, but I doubt that it would be.

Hi Paul,

For example, my old uni used to send outgoing mail from
its-mail1.massey.ac.nz, but MXs are mu-relay{1,2}.massey.ac.nz. The
only place that its-mail1 gets mentioned in the DNS is in the SPF
record, not MX. Presumably that's what you meant by 'outbound MX
host'?

cheers,
Jamie
--
Jamie Riden, CISSP / jamesr () europe com / jamie.riden () gmail com
NZ Honeynet project - http://www.nz-honeynet.org/

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