On Wed, Apr 23, 2025 at 08:32:31PM +0300, Mike Teplynin wrote:
> > Why do you want to break Bcc by recording all envelope recipients in
> > headers? Unless you can guarantee that all messages are
> > single-recipient, or that Bcc is never used/intended by the user,
> > adding such headers is likely a mistake.
>
> That's an interesting point, I hadn't thought of that case. Is there a
> way to avoid that but also keeping the "normal" recipients in custom
> header?
Generally not for messages relayed via SMTP. For final delivery, the
"O" flag of the lmtp(8), smtp(8) and pipe(8) and default for the
local(8) and virtual(8) transports, the "X-Original-To" header is added,
provided, in the case of lmtp(8), smtp(8) and pipe(8) the transport's
recipient limit is set to 1. Note, X-Original-To records the *input*
(original) recipient address, before any rewriting, possibly as given by
the sending system via "ORCPT=" if DSN is not disabled in your inbound
SMTP service.
See the documentation of smtp(8), lmtp(8), pipe(8), virtual(8) and local(8).
If (not generally advised) you are willing to also split the envelope
for relayed messages into separate deliveries for each recipient, then
you can use the "O" option of smtp(8) for the associated transport
and have "X-Original-To" headers added.
--
Viktor.
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