Is there a way to import all e-mails that have been shared from Hubspot users with contacts so you can track all threads even if they weren't send via Hubspot e-mail panel?
The best way to import emails into the CRM that have already been sent is by using the forwarding address associated with your portal ([Your Hub ID]@forward.hubspot.com). You can send the individual emails to this address and they will associate with the contact's timeline.
For more information regarding the forwarding address, I would recommend taking a look at this article: Forwarding emails to the CRM.
The best way to import emails into the CRM that have already been sent is by using the forwarding address associated with your portal ([Your Hub ID]@forward.hubspot.com). You can send the individual emails to this address and they will associate with the contact's timeline.
For more information regarding the forwarding address, I would recommend taking a look at this article: Forwarding emails to the CRM.