Also posted this question to the mailman3 list yesterday. Andrew Hodgson sent an informative answer, so that's probably it. "Amazon SES rewrites the Message-ID. Yep and for this reason I don't use it. The problem is worse in Mailman3 because it has a much more superior archive display which gets ruined when people reply to messages with different Message-Id headers and the threading can't be observed. I also had to use the anonymous mode with my list as Amazon didn't like me using random addresses in the From: header. I'm still looking for a tolerant mail gateway to use with Mailman."
On Thu, May 4, 2023 at 9:18 AM Sam Darwin <samuel.d.dar...@gmail.com> wrote: > > Hi, > > We are running mailman2 with postfix and CentOS. For a long time the > mail gateway was mailgun. Recently switched to Amazon SES. > > Now there are complaints that "threading" isn't right. That is, > organizing the results according to topic, and correlating replies > with specific other replies. > > It turns out that "The Amazon Simple Email Service (AWS SES) rewrites > the Message-ID header of outgoing emails." > > This means the References and In-Reply-To headers can't be relied on > anymore also, since they won't always match up. These headers: > > Message-ID: <127401d9389b$e874b7f0$b95e27d0$@gmail.com> > References: <126301d93891$58081b80$08185280$@gmail.com> > In-Reply-To: <126301d93891$58081b80$08185280$@gmail.com> > > might now appear as: > > In-Reply-To: > <010f0187dca41ec8-478dfff5-d27d-4879-ab72-072be2f76176-000...@us-east-2.amazonses.com> > References: > <010f0187d80eb0dd-93bebdd9-cabf-4ad6-a7f4-b5515bd22d31-000...@us-east-2.amazonses.com> > <010f0187dca41ec8-478dfff5-d27d-4879-ab72-072be2f76176-000...@us-east-2.amazonses.com> > > But perhaps a main problem is that for a large outgoing mailing, the > Message-ID might not be consistent when sending to 1000's of > recipients. Maybe not everyone sees the same Message-ID. > > Any thoughts on the topic? > > Has anyone used Amazon SES, and does the "threading" in the archives > line up correctly? > > Thanks, > Sam ------------------------------------------------------ Mailman-Users mailing list -- mailman-users@python.org To unsubscribe send an email to mailman-users-le...@python.org https://mail.python.org/mailman3/lists/mailman-users.python.org/ Mailman FAQ: http://wiki.list.org/x/AgA3 Security Policy: http://wiki.list.org/x/QIA9 Searchable Archives: https://www.mail-archive.com/mailman-users@python.org/ https://mail.python.org/archives/list/mailman-users@python.org/ Member address: arch...@jab.org
