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Re: fixing insecure email infrastructure (was: Re: [eweek article]Window of "anonymity" when domain exists, whois not updated yet)
Steven Champeon wrote:
on Thu, Jan 13, 2005 at 10:25:18AM +0530, Suresh Ramasubramanian wrote:Yep. And it helps if the rDNS is "right-anchored", (uses "subdomains"On Wed, 12 Jan 2005 23:19:47 -0500, Valdis.Kletnieks@vt.edu <Valdis.Kletnieks@vt.edu> 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 ppp-XXX.adsl.example.com, try to give it unique and non generic rDNS, preferably with a hostname that starts off with smtp-out, mail, mta etc)"
What is wrong with MTAMARK? MTAMARK tags the reverse entries of IP addresses where SMTP servers are. Fixes this problem very fast, efficient and with little effort (script magic to regenerate the reverse DNS entries). ftp://ftp.rfc-editor.org/in-notes/internet-drafts/draft-stumpf-dns-mtamark-03.txt -- Andre