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. Therefore, I hesitate to refuse normal delivery of emails on the basis of such unreliable criteria. And even if I refuse to deliver the email to the Inbox, I deliver it to the Junk. And we ended up where we started. In order to deliver email to Junk and return a 5xx error to the sender, I need to use fakereject and solve the problem with DSN. -- 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/
