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From: Célestin Matte <[email protected]>
To: Magnus Hagander <[email protected]>
To: Alvaro Herrera <[email protected]>
Cc: [email protected]
Subject: Re: [PATCH] pgarchives: parser: handle messages in which Message-ID is missing
Date: Fri, 5 Nov 2021 12:31:23 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <CABUevEyhYyx4DJ_7kENZry2wwZYz9R4J_oh8f0cKkUY+3Q8Kfw@mail.gmail.com>
References: <[email protected]>
	<[email protected]>
	<CABUevEyhYyx4DJ_7kENZry2wwZYz9R4J_oh8f0cKkUY+3Q8Kfw@mail.gmail.com>

> Have you actually come across any case where a *proper* non-spam message is sent without a message-id and passes through actual mailservers on the way? 
> 
> Looking through the approximately 1.4 million mails in the postgres list archives, not a single one has a message-id generated by the archives server MTA (which is configured to generate it). Not a single one by our inbound relay servers. And exactly one by the pglister server -- which turns out to be a bounce that ended up in the archives because of a misconfiguration back in 2018 that's not visible in the public archives.

After some tests, I do have a very few number of non-spam examples (3 emails from 2 different people in a postfix+mailman mbox of 5k emails), but they date from 2003-2007.

Exim already handles empty Message-IDs by default by generating them [1], although it will let a message with Resent-Message-ID pass through as-if. I tested such a case, and pglister seems to actually drop the message (or fail silently).


[1]: https://www.exim.org/exim-html-current/doc/html/spec_html/ch-message_processing.html#SECID226
-- 
Célestin Matte

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