On 2/6/2021 3:19 AM, Alessandro Vesely wrote:
On Fri 05/Feb/2021 22:53:34 +0100 Dave Crocker wrote:
On 2/5/2021 1:44 PM, Valdis Klētnieks wrote:
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).
Even then, actual delivery usually happens one mailbox at a time, in a
loop.
A variation on John's response: A protocol specification is not an
implementation specification. Your comment is about an implementation
choice. The only requirement for a protocol spec is that it not prevent
reasonable implementation.
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.
Perhaps, the case of delivery to multiple mailboxes should be
anticipated in Section 3.
I've added a pointer to Security Considerations.
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...
The case of shared IMAP folders is also straightforward. The
Delivered-To: contains the mailbox of that folder if it has one, or the
mailbox of the recipient whose filter directed the message to that folder.
Shared folders are unrelated. A Shared folder has a single address.
A different issue is implementations that store a single copy of a
message sent to multiple addressees. The text is meant merely to
highlight a concern for divulging other addresses, not to suggest solutions.
d/
--
Dave Crocker
Brandenburg InternetWorking
bbiw.net
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