On 6 Dec 2016, at 22:40, John Levine wrote:
In article <5ef35d60-7f27-4b35-b2e8-53a20aa61...@blighty.com> you
write:
I know there's no standard header for storing the envelope recipients
for a message (for good reason, especially
when it comes to Bccs) but there are times when it's useful.
Does anyone know of a system that does that? I'm stashing them in
"X-Rcpt-To" at the moment, for lack of anything
better, but if there's even a marginal ad-hoc standard for it I'd
like to be consistent.
Oh, and some MTAs put them in Delivered-To: lines at the top of the
message, after
the Return-Path:.
Technically I believe that is usually the final delivery address, after
local rewrite/de-tag/alias transformations, NOT the original sender
envelope. For example, my Postfix config adds these headers above its
Received header for mail from this list:
Return-Path: <mailop-boun...@mailop.org>
X-Original-To: mailop-20160...@billmail.scconsult.com
Delivered-To: real.u...@hostname.not.exposed.in.public.scconsult.com
The X-Original-To address goes through 2 transformations to become the
Delivered-To address, which wouldn't work for a non-local SMTP sender in
any case.
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