SM wrote:
At 15:29 28-11-2008, David Nicol wrote:
There are some assertions that I think are true and which apparently
aren't obvious, such as
1: operations internal to a realm are outside the scope of proposals
Could you define "realm"? Is that similar to ADMD? A message can be
relayed through several administrative entities before final delivery.
These entities might only have weak relationships between then. I don't
think it's possible to segment the entire delivery path into two parts.
If you follow the path of a given message, you find exactly one point
where an MTA looks up the global DNS, determines a target host in the
recipient domain's MX, and delivers to one of them. The boundary
between the two realms lays in the middle of that hop. (Further hops
from a backup MX to a higher priority one are conventionally in the
recipient's realm.)
That doesn't necessarily coincide with an ADMD.
In case the message is further forwarded, e.g. this message, there
must be a host who holds the additional piece of data that I call a
forwarding recipe(*). The next segment is part of the recipient realm,
if the target address in the recipe is being used with the permission
of its owner.
[*] http://fixforwarding.org/wiki/forwarding_recipe
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