Re: Email Subaddressing

["D. J. Bernstein" <[e-mail]>]

> If the ability to mix and match MUAs and delivery agents is important,

In practice the interface is the mailbox. The delivery agent writes the
message to the mailbox in some standard format, and the MUA reads it.

MUAs don't generally seem to care about the envelope, except possibly
for displaying the return-path.

It would be possible to do something different. Many delivery agents
record the envelope recipient in a usable format. The MUA could read the
subaddress and use it for sorting. Chris, would it violate your ``MUST
NOT automatically create new folders'' requirement if the MUA showed the
user a list of the subaddresses that had been shown up, and allowed the
user to browse each subaddress as a folder? Does your answer depend on
how the messages are physically stored on disk?

---Dan
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