Delivers the rendered campaign to the addresses given so it can be checked in a real inbox. This is a real send to those addresses only: the campaign's audience is untouched and the campaign stays a draft. Recipients are added to the account's "My Test Contacts" list.

Limits: up to 30 addresses per call (1 on the free plan) and 30 test sends per account per day, shared with Send Test in the SendFox app. A test from a newly created account goes to the account's own address only, unless the campaign sends from a domain the account has verified; notice in the response says so when addresses were dropped.