Hadmut Danisch said:
On Sun, Mar 02, 2003 at 07:18:05PM -0500, Daniel Feenberg wrote:
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.
No. To be more precise:
The proposal would give the owner of the domain which the
senders e-mail address belongs to control over which servers could originate
SMTP traffic.
The proposal quitly assumes that the owner of a domain (i. e. the
one who is able to define zone entries) is the same who is
allowed to decide who may use this domain in a senders address.
One issue I can see here: if I send mail from my home machine for
mydomain.org, connected using an ISP's dynamic pool of IPs for their DSL
users, then I either
(a) need to know that ISP's address ranges
(b) need to update my RMX records dynamically each time I connect,
and this needs to match my mail *at the time the recipient checks
it* (ie potentially breaking the store-and-forward model!)
(c) need to set up a static-IP deal with the ISP, or buy a colo
server ;)
(d) need to use an "allow all" 0/0 mask for mydomain.org.
How do we solve this? Is there another solution?
BTW note that this, in general, does seem to be a very promising approach
(and one that's been mooted a few times before in various forms ;)
cheers,
--j.
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