Custom domains

Custom domains let teams separate environments, brands, and operational workflows without relying on generic shared sender identities. They are the fast path for teams that need controlled inbox ownership, environment-specific addresses, cleaner aliasing, and sender identities that match how the business actually ships messaging.

Use custom domains when reply handling, environment separation, or branded inbox ownership needs to stay under your control. Most teams start with one branded domain, add aliases by workflow, and then extend into routing, verification, and sender-health controls.