On Jul 31, 9:36pm, D. J. Bernstein wrote:
Subject: Re: Email Subaddressing
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.
All this does is push the question off a level. Is it desirable to be able
to mix and match MTA, delivery agent, and submission agent?