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Please read the docs
HubSpot's UI for Outlook and Gmail seems more natural to the reps and is updated more often. Unfortunately, you'll never capture that data in Marketo without using the API to connect those events somehow. You should also be careful with unsubscribes because they won't be synced.
A lot of teams have this problem with HubSpot CRM, Salesloft, etc. You need to discuss what the reps want to do and why, and how best to help them. They should not use unverified systems (and I bet they never got a full contract with HB).