fixing insecure email infrastructure (was: Re: [eweek article] Window of "anonymity" when domain exists, whois not updated yet)

Suresh Ramasubramanian ops.lists at
Thu Jan 13 04:55:18 UTC 2005

On Wed, 12 Jan 2005 23:19:47 -0500, Valdis.Kletnieks at
<Valdis.Kletnieks at> wrote:
> On Wed, 12 Jan 2005 19:19:24 PST, Dave Crocker said:
> > In general, that's what dkeys/iim and csv (and maybe spf) are attempting to provide.
> Yes, but he asked for a rDNS solution specifically...

I think Steve was referring to some things that can be implemented
right away, like "if you operate a mailserver, please make sure that
it isn't on a host that has reverse dns like,
try to give it unique and non generic rDNS, preferably with a hostname
that starts off with smtp-out, mail, mta etc)"

Basically a call to operators to adopt a consistent forward and
reverse DNS naming pattern for their mailservers, static IP netblocks,
dynamic IP netblocks etc.

Suresh Ramasubramanian (ops.lists at

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