Currently the only way to integrate Hubspot with a private inbox hosted by Google and accessed on a Mac is via Chrome and the Gmail web interface.
My company’s email is hosted via Google, but I won’t use the webmail client because it is so ugly I’m afraid of going blind or insane from using it.
Also, Chrome is a serious privacy nightmare, so I don’t use it either.
There is currently a Hubspot plugin for Outlook on Windows, it would be very helpful is there was something similar for Outlook on Mac.