On 9/14/23 08:03, Thomas Hoffmann (Speed4Trade GmbH) wrote:
Sorry, I thought removing all content and subject is sufficient. Maybe the 
message-id header is used internally(?)

TL;DR: technical details about message threading.  Not about Tomcat.

This is what happens when you reply to an existing message for a new topic rather than starting a brand new message:

https://www.dropbox.com/scl/fi/6f6xqoj9ndznr1pwnluuk/bad-threading-tomcat-user.png?rlkey=q6385e4fqyd2ngp97qgj4bj3y&dl=0

There are headers in the message that facilitate threading that you can't normally see. These are the relevant headers in the message you replied to:

References: <9ebb0e5d-1794-92f6-9c9f-47a235a4e...@touchtonecorp.com>
 <057e2b5435244011898683f843170...@speed4trade.com>
 <5f704d72-03ea-457c-8d44-792ecda97...@elyograg.org>
 <80c5af8d-d267-581a-0877-687413cd6...@apache.org>
 <4011ac44-d7b8-3fa1-5676-34cbd9207...@christopherschultz.net>
 <c668d2c4-f475-5303-9cba-802edd438...@touchtonecorp.com>
In-Reply-To: <c668d2c4-f475-5303-9cba-802edd438...@touchtonecorp.com>
Message-ID:
 <CANQXucfXnysDtn1kmK320AF6uYjrp=ncnmcuvsjbk9zvela...@mail.gmail.com>

And these are the relevant headers in your reply:

Message-ID: <62e04634351c4c62ae75848a77dac...@speed4trade.com>
References: <9ebb0e5d-1794-92f6-9c9f-47a235a4e...@touchtonecorp.com>
 <057e2b5435244011898683f843170...@speed4trade.com>
 <5f704d72-03ea-457c-8d44-792ecda97...@elyograg.org>
 <80c5af8d-d267-581a-0877-687413cd6...@apache.org>
 <4011ac44-d7b8-3fa1-5676-34cbd9207...@christopherschultz.net>
 <c668d2c4-f475-5303-9cba-802edd438...@touchtonecorp.com>
 <CANQXucfXnysDtn1kmK320AF6uYjrp=ncnmcuvsjbk9zvela...@mail.gmail.com>
In-Reply-To:
 <CANQXucfXnysDtn1kmK320AF6uYjrp=ncnmcuvsjbk9zvela...@mail.gmail.com>

While some mail clients will create threads on the message subject, these headers are the strictly correct way to show threads. We also see messages where people send a reply to a thread by writing a new message with the same subject. Clients that do threading properly will not show those messages as part of the thread.

Thanks,
Shawn


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