Re: [exim] Spam with no Message-ID header?

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Auteur: Mike Cardwell
Date:  
À: exim users
Sujet: Re: [exim] Spam with no Message-ID header?
John W. Baxter wrote:

>>>> curious about the second: can a message really get to the delivery
>>>> point without a Message-ID header?
>>> If I remember well, only in submission-mode exim should do some
>>> fixups (Message-ID, Date, Sender, ...).
>> Yes, I remember setting that option a few years ago on my outgoing
>> exim. ISTR (but I could be wrong) that I needed to do it because
>> messages were getting rejected by subsequent mail servers for not
>> having MIDs.
>
> [Catching up]
> Unfortunately, having a Message-Id: header is still a SHOULD, even in RFC
> 5322. So one really ought not to reject based (only) on their lack. It would
> be very nice if I could. (And if running a server only for myself, I likely
> would, with provision for an exception list.)


My first stop when considering how much of a spammy indicator a metric
is, is to check out what the default SpamAssassin score is for it. When
SpamAssassin notices a message without a Message-Id header, it *does*
note it in the report, but it doesn't actually apply a score. Ie:

0.0 MISSING_MID            Missing Message-Id: header


I'm assuming that there is a lot of ham out there with missing
Message-Id headers, or SpamAssassin would be assigning at least a score
of 0.1 for it...

Perhaps they put it in the report so it can be used for bayes.

--
Mike Cardwell - IT Consultant and LAMP developer
Cardwell IT Ltd. (UK Reg'd Company #06920226) http://cardwellit.com/