Re: Amazon SES

From: Sam Darwin (samuel.d.darwin_at_[hidden])
Date: 2023-05-04 15:54:01

The comments about Message-ID: , References: , and In-Reply-To:
headers are very interesting.  "The Amazon Simple Email Service (AWS
SES) rewrites the Message-ID header of outgoing emails."
Consider the very first email of a thread. It arrives at the mailman
server with a Message-ID that mentions "gmail", for example, and is
added to the Archives. The message is sent out to all list members,
who see a new Message-id of
...010f0187dca41ec8_at_[hidden]   Later replies can set
the In-Reply-To header to refer the "@us-east-2.amazonses.com"
Message-ID.  But the first archived message didn't yet have that ID,
since it arrived directly at the server, not through SES. The mailman
archives on lists.boost.org organize that first message in a separate
thread, presumably based on the original Message-ID.