Assignments decide how threads reach the right teammate, and how contacts get grouped into companies.
Where to find it
Settings > Assignments.
The three settings
Auto-assign to Linear owner routes a thread to the customer's owner in Linear. It works only when that owner is also a member of your workspace, so check membership first if routing looks quiet. It needs the Scale plan or above.
Follow latest email sender switches the thread's contact to whoever sent the most recent inbound email. It helps on threads that pass between several people at a customer. It is off by default, and it skips automated senders and your own domain.
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.
How domain grouping decides
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.