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 noreply@??? 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:victor@corvax.kiev.ua
public GnuPG/PGP key:
https://victor.corvax.kiev.ua/corvax.asc
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