To: Andrew Reilly <areilly@bigpond.net.au> Cc: freebsd-stable@freebsd.org Message-ID: <7338D9DD-E075-4382-9769-8188FDC639EB@iitbombay.org> References: <C608E59C-C231-493D-A744-E448BBB92C75@bigpond.net.au>
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> On Apr 14, 2024, at 3:33=E2=80=AFPM, Andrew Reilly = <areilly@bigpond.net.au> wrote: >=20 >=20 > 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=99= s a Return-Path: header that captures the envelope-from, but I haven=E2=80= =99t 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= =99s not really my question. >=20 > 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? The Sender: field is optional. I don't know why FreeBSD stopped using it = but I filter on List-Id: (which is used by pretty much every mailing = list), which seems more appropriate.=
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