On Sun, 21 Sep 2025, via Alpine-info wrote:
A possible workaround might be to add a similar option that matches on
Delivered-To: headers, applies a sed(1)-style transform, and copies the
result to the From: field.
Is there any other header besides Delivered-To that has the information you
need? My information is that this header is defined in an experimental RFC
from about 3 years ago, but I do not find it in the headers of the message
I am replying to, so it has not been widely adopted yet.
Huh. It's been in both qmail and Postfix for more than twenty years; and
it's been in Gmail since launch.
It also seems to be a well-known, standard answer to this kind of problem.
There are plenty of Stack Exchange, etc, answers that mention it, going back
for at least fifteen years. See, e.g.,
https://webapps.stackexchange.com/questions/5719/is-it-possible-to-create-a-gmail-filter-that-works-on-headers-other-than-from-t
I had assumed it was universal. :(
Neither Delivered-To nor X-Delivered-To are in the Exim source but the
test configs contain examples of each, so it is possible with Exim,
but not enabled by default in the default config.
As far as I know, there isn't another usable header; and certainly not one
that's more widely deployed than Delivered-To.
The draft RFC
https://www.ietf.org/archive/id/draft-duklev-deliveredto-00.html
suggests that Delivered-To does not need to match the
sender address, nor the envelope sender. It is merely
an MDA-specific representation of the mailbox
to which a message was delivered.
It says that some MTAs store the "RCPT TO" address in a Envelope-To or
X-Original-To header.
--
Andrew C. Aitchison Kendal, UK
[email protected]
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