Exim 4.97 Seems to Break MailScanner 5.4.5 due to Change in MessageID Length?

Shawn Iverson shawniverson at summitgrid.com
Mon Nov 6 16:58:31 UTC 2023

On 11/6/23 11:44, Tony Yates wrote:
> Dear MailScanner,
> I just tried an upgrade of Exim to the very recently released version, 
> 4.97 and the mail system seemed to break.  Messages disappeared.   
> They wold show as a line entry in a Mailwatch recent messages list, 
> but the actual message behind that entry would return Message ID 
> '7h01hZ-000000004Pk-1fWj' not found!
> I note from the release notes on 4.97 that the Exim internal MessageID 
> format has changed,
> as per:  "The internal (but exposed in logs, Received: headers and 
> Message-ID: headers)
>    identifier used for messages is longer than in the previous release"
> From: 7h02TT-0001wI-1b
> To: 7h01hZ-000000004Pk-1fWj
> I'm wondering if this might be the cause, but not sure yet where to 
> dig in to the code and see.  I'm hoping that you might know the answer 
> without the need to dig too far?

This is likely the culprit, but I'll need to dig into the code to find 
out why.



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