InboxPolicy

InboxPolicy tells Claude whether an email address is safe to send to. Instead of a raw validity score, each check returns one action (send, send_with_caution, review, retry_later or avoid) with a reason, a confidence score and the signals behind it: catch-all domain, disposable address, free mailbox provider and role account such as info@ or sales@. Use it to check a lead before outreach, clean a list before a campaign, or screen sign-ups. Check single addresses with decide_send or verify_email. Lists of up to 50,000 addresses run in the background as a batch, with progress and per-address results you can page through. Pricing is prepaid credits: each check costs 1 credit, re-checking the same address within 72 hours is free, and malformed addresses are free. estimate_credits prices a job before you run it, and get_usage shows your remaining balance. To connect, sign in with your InboxPolicy API key on the InboxPolicy sign-in page. Claude receives an encrypted access token, never your key in plain text.