Last Contacted field in Deal should include emails through Outlook

I look at the last contacted field on a deal to make sure our contacts and deals are being followed up on regularly. However, if an email is sent through Outlook instead of Hubspot (which we do often for various reasons), it doesn't log as a contact. I would like that field to update any time one of the associated contacts is sent an email, regardless of the platform that sends it. Thanks! 

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