Suppress an address

Block one address ({ email }) or up to 1,000 at once ({ emails: [...] }) from receiving any future sends from your workspace. The operation is idempotent — re-suppressing an existing address returns 200 rather than a conflict. The bulk form returns an { object: "list", added, skipped, total } summary. Suppression is the hard stop; to let recipients opt out of just one kind of email, use topics (see Create a topic). Undo with Un-suppress an address. Requires the suppressions:write capability.