On Wed, 25 May 2005, Bruce Lilly wrote:
No. Being based in a comparison of IP addresses derived from a DNS RR
related to a domain name from EHLO/HELO, it suffers from the same
problems with that approach as SPF.
1. conflating sending and receiving
2. failure to understand fundamental properties of SMTP, e.g.
MAIL FROM remains unchanged during transport
3. attempts to assign a relationship between domain names
and IP addresses for sending email; there is no such
None of which is true for CSV. Regarding option 3, CSV allows sites to
declare a stronger association between host names and IP addresses, which
SMTP servers can check. Since this is an extension to existing practice,
prior limitations do not apply.
f.a.n.finch <dot(_at_)dotat(_dot_)at> http://dotat.at/
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