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<div class="moz-cite-prefix">On 10/7/2019 2:03 AM, Masataka Ohta
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:25c6b381-e2cf-fc24-aa33-6fac918df983@necom830.hpcl.titech.ac.jp">Forrest
Christian (List Account) wrote:
<br>
<br>
<blockquote type="cite" style="color: #000000;">I've been ignoring
this discussion because I feel this ship sailed many years ago,
and IPv6, like it or hate it, is the best way
<br>
forward we have.
<br>
</blockquote>
<br>
A problem is that there is a cliff edge in front of you.</blockquote>
<p><br>
Likewise for spam filtering - spam filtering would be knocked back
to the stone ages if IPv4 disappeared overnight. IPv6 is a spam
sender's dream come true, since IPv6 DNSBLs are practically
worthless. Yes, there are OTHER filtering techniques, but none
that scale nearly so much with as extremely little resources
required. And this is a problem for large and small organizations.
Even the very largest email systems would be extremely disrupted
if IPv4 DNSBLs (internal and/or 3rd party) were not available
within the very near future. Solutions to this problem would then
severely disrupt their business/financial models for those mail
systems since the overhead costs per mailbox would significantly
increase.<br>
</p>
<pre class="moz-signature" cols="72">--
Rob McEwen
<a class="moz-txt-link-freetext" href="https://www.invaluement.com">https://www.invaluement.com</a>
</pre>
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