skink

Real-time email verification API — actual SMTP handshakes, not just syntax checks. Resolves catch-alls, even behind Proofpoint/Mimecast, where most tools return "unknown." Every result ships reasons[] and a calibrated confidence score, never laundered into a false "deliverable." MCP server for Claude/Cursor, or bulk CSV. Unknown results are free. We verify your list and stop there — encrypted at rest, retention you set. 100 free credits, no card.