What is a domain trust tree?

A domain trust tree visualizes the relationships affecting reputation across your sending identities:

Root domains form the trunk, with subdomains branching as children that may inherit or share reputation signals.

Shared infrastructure links separate domains through common IPs, authentication records, or ESP accounts.

Link domains and tracking URLs create connections between otherwise-separate sending domains.

Mapping your trust tree reveals contamination pathways where problems can spread and isolation gaps where you thought domains were separate but connections exist.

Use the map to make informed decisions about where additional isolation is needed and which connections are acceptable.

The trust tree is your organizational chart for domain relationships. It shows which divisions can suffer independently and which share fate with the parent company.