> On 01/02/2024 03:49 EET 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.
> 
> I could have an email from 1996 titled “Groceries” and if I make one today 
> titled “Groceries” my inbox would have them connected as one long thread. I’m 
> getting email threads in the 100s because of this.
> 
> Crossbox people have told me it’s not something they have control over. They 
> mentioned it being a Dovecot problem. Has anyone encountered this?
> 
> It would be tremendously inconvenient to ensure that every email I ever send 
> from now on has a unique subject so to as not have them threaded together. 
> Let me be clear, email threading and conversation views are extremely useful. 
> I just want them to be…relevant to the chain of emails that are being looked 
> at.
> 
> Is there a way to group threads by unique header information? It is becoming 
> borderline unusable to sift through invoices.

You could take a look at https://datatracker.ietf.org/doc/html/rfc5256 which 
explains two threading algoritms, ORDEREDSUBJECT and REFERENCES. ORDEREDSUBJECT 
is probably what you are using now, and REFERENCES is the one you'd want to use?

Aki
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