ietf-822
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Re: Email Subaddressing

1997-07-31 14:32:59
but you included as a local configuration problem
the case where the MUA needs to supply a return address.

MUAs typically pass a partially formed message to a submission agent
supplied with the MTA.

The submission agent figures out From, Return-Path, etc., from a
combination of sysadmin configuration and user configuration. See, e.g.,
http://www.qmail.org/qmail-manual-html/man8/qmail-inject.html.

What's the mechanism for ensuring that they agree on what such a return
address should look like?

They don't have to.

I use VERPs for my outgoing messages---e.g.,

   Return-Path: 
<djb-dsn-869300145(_dot_)16932(_at_)koobera(_dot_)math(_dot_)uic(_dot_)edu>

---so that a program can reliably associate bounce messages with
original messages. The VERPs are created by qmail-inject, not the MUA.
The delivery of djb-dsn-* is handled by qmail-local, not the MUA.

---Dan
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