Re: [Asrg] What are the IPs that sends mail for a domain?

John Levine <johnl@taugh.com> Wed, 17 June 2009 17:55 UTC

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Date: 17 Jun 2009 17:55:34 -0000
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From: John Levine <johnl@taugh.com>
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Subject: Re: [Asrg] What are the IPs that sends mail for a domain?
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>I predict that no significant amount of mail ever originates from IPV6. 
>Because it would be impossible to maintain a DNSBL for IPV6

Why?  I expect that v6 DNSBLs will list /64s by default, which makes
them roughly analogous to v4 DNSBLs.

I also doubt that it is a very good idea to assume that DNSBLs will
always be the way that people do reputation management.

R's,
John