On Thu, 2004-12-02 at 19:31 +0100, Andre Oppermann wrote: > Have a look at what I wrote on NANOG. It applies perfectly well to > Switzerland too. > > If all ISP's in Switzerland (or at least the large ones) would put MTAMARK > (default) records into their reverse zones we would have solved the entire > SMTP zombie problem. > > What do you think?
I quite like it, I might say. They could even double it up; check the IP for this DNS mark record but also have a: _send._smtp._srv.smtp-out.example.org. IN TXT "1" _send._smtp._srv.*.example.org. IN TXT "0" Then _send._smtp.<ip>.in-addr.arpa/ip6.arpa must be "1" _and_ the EHLO name must be "1" too, otherwise this hostname should not be used for sending mail either There is one minor problem though for folks who get a DSL line etc, but no control over the reverse though... as they are then locked-in by the ISP that controls their reverse. Then again, submission helps out here. Greets, Jeroen
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