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.
3: no additional SMTP messages should be generated by operation of the system
That rules out delivery status notifications. Such notifications
aren't necessarily bounces.
#2 answers your question. I do not assert that "the recipient MX
always knows everything there is to know about whether an email will
be successfully delivered or not" if "successfully delivered" means
"reaches the recipient's eyeballs" but I do believe that a recipient
MX has enough information to make an accept/trylater/reject decision,
which is what SMTP requires it to do.
Could you point me to the relevant section of RFC 5321 which
describes that requirement?
Regards,
-sm
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