Every send to a dead address is a hard bounce — and the mailbox provider scores the sender, not the purchase, so a stale list taxes your deliverability long after you forgot you bought it. 40% of addresses go dead within two years (NeverBounce) and 23% of contacts change jobs within one (ZoomInfo 2025), which is why static bases bounce 10–35% while SMTP-checked-at-use lists sit at 2–5%. A check that lives in a dashboard is a check a human runs on Monday; a check that lives inside your agent runs on the send. Fresh data also beats stale bases by 42% on response (HBR 2024) — the timing of the check, not the size of the list, is the variable you control. TAPAC is an MCP server for your agent: it resolves contacts and verifies each address over SMTP before the email leaves. Install with `npx -y @tapacapi/mcp`, key at https://tapacapi.com/get-key — pay per use ($0.10–0.50 per contact, 100 searches free, no annual contract). How many hard bounces did your last campaign send before a human opened the report?