[Asrg] Re: RMX Records

Since no one else has followed up, I will ask some questions. They are not
meant as complaints, but an RFC doesn't serve well as a persausive
document. 

If respected by receiving MTAs, the proposal would give the owner of the
DNS space in which a host lives control over which servers could originate
SMTP traffic. This seems a reasonable delegation of authority, but is
likely to be controversial. Alternatively, the owner of the IP address
range could be given this authority. Why pick one or the other?

Why this is superior to Adam Filip's proposal (
http://groups.google.com/groups?q=vixie+mx+records+spam&hl=en&lr=&ie=UTF-8&oe=UTF-8&selm=3E18B0B3.43939A35%40Andrzej.Adam.Filip&rnum=10
)  to overload the existing MX record? That proposal would also vest
authority in the owner of the domain name. It would seem that requiring
modifications to the DNS system is a substantial additional obstacle to
adoption. Do you have reason to believe that DNS software authors/vendors
would cooperate?

Does the RMX record for relays.danisch.de include all the valid sources of
SMTP traffic for subdomain.danisch.de, or does the receiving server
recurse down to relays.subdomain.danisch.de for that list?

Would you expect operators to reject mail without a valid RMX record? I
can see subtracting a point from the spam score for a valid RMX. It would
be hard to justify to most users rejecting mail entirely. Is that what you
envision? 

feenberg at nber.org 

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