Inbox Check — Email Deliverability Test

Wraps the Inbox Check REST API so your agent can test email deliverability across nine real provider mailboxes: Gmail, Outlook, Yahoo, iCloud, AOL, GMX, T-Online, Mail.ru, and Yandex. Exposes five tools to create tests, retrieve placement results (Inbox, Spam, Promotions, Updates), check SPF/DKIM/DMARC authentication, grab screenshots, and list or delete past tests. Useful when debugging why transactional emails land in Spam, QA-ing cold email templates before a campaign, or monitoring shared-IP reputation over time. Requires an API key from the hosted service. The underlying mailboxes are real IMAP accounts, not simulations, so you get actual filter verdicts and authentication header parsing.