Re: Can Courier's ID tell something abou t SMTP transactions?

Sam Varshavchik <[email protected]> Tue, 03 Jun 2025 07:39:07 -0400

Newsgroups	gmane.mail.imap.courier.general
Message-ID	<[email protected]>

Alessandro Vesely writes:

> Hi,
>
> I sent myself a message from Gmail to three addresses of mines.  Two were in  
> the same domain (tana.it) while the third was on a different domain.  I got:
>
> Received: from mail-yw1-f169.google.com (mail-yw1-f169.google.com [::ffff: 
> 209.85.128.169])
>   (TLS: TLS1.3,128bits,ECDHE_RSA_AES_128_GCM_SHA256)
>   by wmail.tana.it with ESMTPS
>   id 00000000005DC07B.00000000683ECFF8.00005BE8; Tue, 03 Jun 2025 12:35:36  
> +0200
>
> Received: from mail-yw1-f169.google.com (mail-yw1-f169.google.com [::ffff: 
> 209.85.128.169])
>   (TLS: TLS1.3,128bits,ECDHE_RSA_AES_128_GCM_SHA256)
>   by wmail.tana.it with ESMTPS
>   id 00000000005DC07B.00000000683ECFF8.00005BE8; Tue, 03 Jun 2025 12:35:36  
> +0200
>
> Received: from mail-yw1-f175.google.com (mail-yw1-f175.google.com [::ffff: 
> 209.85.128.175])
>   (TLS: TLS1.3,128bits,ECDHE_RSA_AES_128_GCM_SHA256)
>   by wmail.tana.it with ESMTPS
>   id 00000000005DC05A.00000000683ECFF8.00005BEA; Tue, 03 Jun 2025 12:35:36  
> +0200
>
> As you can see, the copy sent to a different domain even arrived through a  
> different host.
>
> Time is clearly the middle item in id:
> ale:~$ date --date=@$((16#00000000683ECFF8))
> Tue 03 Jun 2025 12:35:36 CEST
>
> The other two must be pid and inode.
>
> By the first two messages having the same id, can I deduce they were  
> received in the same transaction?

They were the same message, it was one message with multiple recipients.  
Each recipient mailbox received a copy of the message, differing only in the  
Delivered-To: header.

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