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Topic: Sent mail thread is not showing up under recent date

==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.6.1
- Deployed with iRedMail Easy or the downloadable installer? Download
- Linux/BSD distribution name and version: Ubuntu 22.04
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): LDAP
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? Yes
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

In some cases, a reply in a thread is not showing up at the most recent sent date.  I am showing at least one thread where there have been a couple dates newer in the thread than the date where the the thread comes up in the Sent folder.  So in this case the thread has a reply on Dec. 15th but in that same users interface the thread is only showing in Sent items on Nov. 8th.  The only thing that may be strange is that the user changed the Subject line while replying in the thread.

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Re: Sent mail thread is not showing up under recent date

"Thread" is identified by the "Message-ID:", "In-Reply-To:" and "References:" headers, if they were changed, then it's not considered as part of the thread anymore.

Also, thread is totally a MUA thing.