On Thu, 01 Feb 2024 01:49:16 -0000 wakod67943--- via dovecot dovecot@dovecot.org wrote:
To preface, I’m using the Crossbox mail client hosted by MXroute. I was directed to Dovecot support when I made my inquiry to the former’s developers.
Apparently, when you write an email subject that is verbatim to another, previously sent email, the two become linked in a conversation thread.
This is not done by dovecot. I just sent myself two test emails with the exact same subject, and they did not appear threaded.
The threading is controlled by specific headers: "References" and "In-Reply-To". If dovecot were to group the messages by subject, I would see one of those headers in the second email. They are not there.
My mail client has a setting called "Attract by subject" that enables the behaviour you describe. Check your settings. Perhaps Crossbox has something similar.