Adam D. Barratt via Exim-users wrote on 19.08.2023 21:21: > On Sat, 2023-08-19 at 19:10 +0300, Victor Ustugov via Exim-users wrote: >> Jeremy Harris via Exim-users wrote on 19.08.2023 18:37: >>> On 19/08/2023 16:29, Victor Ustugov via Exim-users wrote: >>>> But >>>> this won't work if there is no Message-ID header in the original >>>> email. >>> >>> You can safely block any external-source messages lacking a >>> Message-ID header (local ones, where you're being an MSA, >>> not so; some MUAs are dumb and the MSA has to fix then up. >>> Exim does that). >>> >>> RFC 5322 only lists this as a SHOULD (section 3.8.4) - >>> but I see it as spamsign. >> >> I can't block emails that don't contain Message-Id headers. You can't >> even imagine how many emails that do not meet the requirements of the >> RFC come from official organizations, suppliers, buyers. >> >> For example, emails from nore...@cisco.com with a DMARC Aggregate >> Report have a Message-ID header. But it doesn't contain angle >> brackets. >> >> Thus, the absence of the Message-ID header or the incorrect format of >> the Message-ID header are not reliable criteria for refusing to >> deliver a message. >> > > FWIW, Google treat it as a MUST and (at least some of the time) refuse > such messages at SMTP time.
As a postmaster, I can't afford what Google does to senders and its users. -- Best wishes Victor Ustugov mailto:vic...@corvax.kiev.ua public GnuPG/PGP key: https://victor.corvax.kiev.ua/corvax.asc -- ## subscription configuration (requires account): ## https://lists.exim.org/mailman3/postorius/lists/exim-users.lists.exim.org/ ## unsubscribe (doesn't require an account): ## exim-users-unsubscr...@lists.exim.org ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
