Valid means the mailbox exists and accepts mail (score 70-100). Risky means we cannot prove the mailbox exists, usually catch-all domains or role addresses (40-69). Invalid means it does not exist (0-39). Unknown means we could not confirm this time, often greylisting or provider limits.
Never. Unknown results are free and can be re-checked later at no cost.
Free 10 requests per minute, Starter 60, Pro 200, Business 500, Enterprise 1,000. Every response carries X-RateLimit-Limit, X-RateLimit-Remaining and X-RateLimit-Reset so your integration can pace itself.
Free accounts holding credits: 10,000 rows, capped at balance. Starter 10,000, Pro 20,000, Business 50,000. Enterprise 2,000,000.
Plan allowances reset each month. Credit packs never expire and are used after the plan allowance.
Kavik ships a Model Context Protocol server so AI assistants can verify addresses with your API key. It is included on every plan, including Free, and uses the same quota.
No. Verification uses DNS lookups and SMTP-level conversations with the responsible mail servers. No message is ever delivered to the addresses you check.
Bulk results export as CSV or Excel from the dashboard, and every result is available over the API.