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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