Date: Mon, 15 Apr 2024 08:33:05 +1000 From: Andrew Reilly <areilly@bigpond.net.au> To: freebsd-stable@freebsd.org Subject: What's happening to Sender: headers? Message-ID: <C608E59C-C231-493D-A744-E448BBB92C75@bigpond.net.au>
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Hi all,
I can=E2=80=99t think of anywhere else to ask, but this knowledgeable =
group is as likely as any to know what=E2=80=99s going on, I think.
For years and years I=E2=80=99ve been able to filter all of my FreeBSD =
mailing list messages into a separate FreeBSD inbox with a pair of =
simple dovecot-sieve rules:
if address :matches "Sender" "*owner@freebsd.org" { fileinto =
"in.freebsd"; }
elsif address :matches "Sender" "owner*@freebsd.org" { fileinto =
"in.freebsd"; }
(=E2=80=A6 and similarly for most of my other mailing lists). The =
Sender header is (used to be) a reliable reflection of the envelope FROM =
address, which reliably tied things to the email server sending the list =
messages.
On about the 11th or 12th of April, a significant chunk of FreeBSD =
mailing list messages, including especially the git commit messages, =
started showing up in my normal INBOX, evading the filter rules.
Over the weekend I got around to investigating, and discovered that the =
errant messages don=E2=80=99t _have_ a Sender: header. There=E2=80=99s =
a Return-Path: header that captures the envelope-from, but I haven=E2=80=99=
t figured out how to make sieve check that yet: it doesn=E2=80=99t seem =
to like it. Sieve documentation is spectacularly inconclusive, but I =
suspect that the envelope extension might do what I want, but that=E2=80=99=
s not really my question.
Does anyone know why the Sender: header, which used to be so reliable =
that I had thought it an intrinsic part of the SMTP/MTA ecosystem, has =
gone away, or is at least not ubiquitous?
I=E2=80=99m running dovecot and pigeonhole and postfix from ports, on =
stable/14 and feeding messages in using fetchmail rather than direct =
SMTP: I=E2=80=99ve found that exposing an SMTP endpoint requires more =
anti-spam fu than I've been prepared to muster so far. Using fetchmail =
is clunky but it keeps me behind my ISP=E2=80=99s spam filter.
Cheers,
Andrew
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