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. :(
As far as I know, there isn't another usable header; and certainly not one
that's more widely deployed than Delivered-To.
-Jason
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