On May 15, 2008, at 9:18 AM, Frank Ellermann wrote:
Douglas Otis wrote:
This avoids the myriad of SMTP opt-out strategies such as
"MX .", "TXT v=spf1 -all", or "TXT DKIM=DISCARDABLE".
Digression, finally I recall a technical problem (above the
clear disadvantages of opt-out at least for IPv6) with the
null-MX idea, one of those weird "alternate roots"
Then that's not the domain name system, so is likely out of scope for
anything DNS related.
managed
to have an IPv4 (A record) for its wannabe-root.
If the person doing the DNS query is falsifying data, there's not a
lot you can do to defend against that, but it's their problem, not
yours.
Cheers,
Steve
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