Help for UID THREAD and SORT optimization

[Timo Sirainen]

On 2 Oct 2018, at 12.22, Alessio Cecchi <alessio at skye.it> wrote:
> 
> Hello,
> 
> we are developing a library to show last arrived messages of all threads in a folder with more than 300k messages.
> 
> As per the RFC 5256, the IMAP thread command has only the option to specify the grouping criteria (REFERENCES vs ORDEREDSUBJECT). So we implemented an algorithm which gets the full UID SORT ordered by date in reverse order then gets all thread relations and then post process all outputs to obtain the final result.
> 
It sounds like what you want is REFS threading, which Dovecot supports, but it didn't make it into official RFC: https://tools.ietf.org/html/draft-gulbrandsen-imap-inthread-05 <https://tools.ietf.org/html/draft-gulbrandsen-imap-inthread-05>
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