If you are syncing your emails and frustrated by the noise in your inbox, then you were like me. The lack of custom filters defines frustration. Then Stacey in support showed me this feature that is probably not used enough. 

I took a course on gmail and was converted to a believer of inbox zero. Lots and lots of filters exisit in my gmail.

In the email sync there is a feature that cannot be praised enough.

The only information that is coming into Pipedrive mail are notifications of demo request and free trials.