Amazon SES, Message-ID and mailman

Question

Hi,

We are running a mailman 2 mailing list, and recently switch the mail gateway from another company to now use Amazon SES.
There's a new problem that the mailman archives are not able to group threads together the way they were before.  Users are complaining about issues in their local mail clients.
It seems to be related to the mail header fields Message-ID: , References: , and In-Reply-To: .
If Amazon SES rewrites the Message-ID, it won't match the original Message-ID, and so the second email won't be matched with the first email in the web archives display.  Addtionally, replies are often sent both to the list and to individual participants, and it's critically important that both of these copies have the identical message id.

Is there a way to have Amazon SES not modify the Message-ID header?   Or, any other solution to this particular problem?

Thanks,
Sam

Riku_Kobayashi · Answer

The following document shows "Message-ID" in the header field, so it is possible to send an email with the same ID.  
https://docs.aws.amazon.com/ses/latest/dg/header-fields.html

As described in this document, you can use "SendRawEmail" and include "Message-ID" in the header to send an e-mail with an arbitrary value.  
https://docs.aws.amazon.com/ses/latest/dg/send-email-raw.html  
https://docs.aws.amazon.com/ses/latest/dg/send-email-concepts-email-format.html#send-email-concepts-email-format-header

Amazon SES, Message-ID and mailman

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