Open Source Document Management System | OpenKM

Im having issues applying email filters to IMAP messages (well to old ones it seems)... Hoping somehow can give some pointers...

I have added an IMAP account to a user... I can see emails (all of them) under that user name. This works fine.

I then added a filter, for 'Project A'. These filters work as expected, and I can see emails in the Taxonomy as expected (going back to 2014).

Ok this is great, it actually works... Lets do the same for projects B, C and D...

Unfortunately, it seems as though only NEW emails are filtered for these new projects...

Is there a way to retrospectively filter emails (again)? This is a great feature (mail filters) and I would like to apply it across the board, but parsing old and new emails...

Can I force a filter parse over an entire email set? As an 'Import' function I guess...
Is it tied into the mail importer cron?
Can I setup another script to force this?

I am running 6.3.2-build8289 (I haven't built up the courage to upgrade yet)

Not possible, when you have imported the e-mail it has been created a new object into OpenKM. You do not have correspondence between the mail in the IMAP with mail imported into OpenKM. There's a cursor ( like database ) what is used by OpenKM to continue reading from some specific ldap point. You should import all the mails again.