I'm a little confused.
From what I can tell, you can either have ALL emails synced into pipedrive, which doesn't seem sensible considering there could be sensitive information/data that you wouldn't want ending up on a foreign system that they can access ...
You control what emails are transferred via the use of Labels. I'm struggling to find more information on how to use labels in my email system which can then control the transfer of those emails to Pipedrive.
ps. I've gone through as much of the knowledge base that I can already.