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.
You said:
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
relationship
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.
Tony.
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