
Assignments decide how threads reach the right teammate, and how contacts get grouped into companies.
Settings > Assignments.
Auto-assign to Linear owner routes a thread to the customer's owner in Linear. It applies when that owner is also a member of your workspace. This one needs the Scale plan or above.
Follow latest email sender keeps the thread's contact matched to whoever sent the most recent inbound email, which matters on threads that pass between several people at a customer.
Auto-assign contacts to companies by domain groups new contacts into companies from their email domain. It is on by default.
Each setting saves the moment you flip it.
Public email domains are always left out, so personal addresses do not pull someone into a company. A domain shared by more than one company is skipped rather than guessed. Both cases wait for a manual company assignment, or for an integration to claim the contact explicitly.