Say an email should be moved to a tracker item. Ex.: A reply to a tracker item. Basically filter operations only available in Tiki: https://doc.tiki.org/Email-filters#Only_available_in_Tiki
It needs to wait for the Tiki-Sieve cron job run. We may put this cron to run every 30 minutes. So until then, this message is in inbox, causing confusion.
Such messages should be immediately moved to a temp folder via mail server Sieve, and later moved to the tracker item via Tiki-Sieve-Cron. This temp folder could be called something descriptive like "Tiki-Sieve-rules-to-be-applied" so people don't wonder what it is. And as usual, we want a way to aggregate messages from all these folders in one view (to detect issues with cron)
A benefit: Tiki filters would only need to look in one folder (If Sieve is working)