Hi @Sgram! Welcome to the Community-- happy to have you here 
As far as I know, there is no automatic detection of intent with HubSpot emails. That said, you can filter emails based on keywords in the body, but you’d have to define those keywords yourself.
I also found this idea with similar intent but with clicks: Counter triggers for emails to show buying intent
This could maybe help brainstorm some alternative intent scoring options!
I’d like to invite @Gaurav_Aggarwal to contribute any workarounds they have! Any advice for measuring intent in email replies?
Best,
Kennedy