Re: [ietf-smtp] Fwd: New Version Notification for draft-crocker-email-deliveredto-00.txt

[Dave Crocker <[e-mail]>]

On 2/5/2021 1:44 PM, Valdis Klētnieks wrote:
> On Fri, 05 Feb 2021 11:56:55 +0100, Alessandro Vesely said:
> 
>>      The Delivered-To: header field is added at the time of delivery, when
>>      responsibility for a message transitions from the Mail Handling
>>      (Transport) Service to an agent acting on behalf of the specified
>>      recipient address.
> 
> It's a plausible design that the agent doing final delivery accepts
> responsibility for delivery to multiple local mailboxes (I've often had things
> that ended up delivering to root@localhost and valdis@localhost with one
> invocation of the local delivery agent, for example).  Should the agent
> generate two Delivered-To: headers, or does it *actually* get generated
> appropriately for each copy (at a time later than when the agent accepted
> responsibility)?


The question for the specification is whether it makes clear what the 
specification calls for.  I think it does, but if readers aren't clear 
about it, it would be good to know what about it isn't clear enough.

A different question is how to implement the specification, so as to 
conform to the specification.

For storing a separate copy for each recipient, that seems straightforward.

For sharing a single copy of the message among multiple recipients, the 
answer probably is not straightforward...

d/


-- 
Dave Crocker
Brandenburg InternetWorking
bbiw.net