Running into this issue of auto contact assignment when we are trying to use a BCC to bring emails from our transactional platform into Hubspot contact records. Each time the BCC email comes in, the contact is reassigned to the sending user (which is an alias email). Since we want our B2B sales contacts to retain their owners, we cannot simply use a workflow to clear the ownership assignment out of the contact record each time a transactional email is logged. We also operate with a lot of unassigned contacts/customers since we have contacts that don’t require direct sales experience.
This auto assignment should be in our control, not a default that we can’t turn off.