Send a campaign's email to an address you choose so you can see it before customers do. The campaign's Email channel must be enabled and have a template; otherwise 400. The test isn't added to the campaign's recipient count, but it uses the plan's email allowance (402 when used up).

Prerequisites: a bearer token, and a campaign in your account whose Email channel is enabled and has a template, on a location with an active plan.

Authentication: Account token. The campaign must belong to your own account; otherwise 403.

Rate limit: 60 requests per minute, counted per user (the token’s user).