Single REST API that returns a normalised verdict (valid / invalid / risky / unknown) and a 0–100 risk score for any email. Disposable, MX, SMTP RCPT TO, role/catch-all, reputation.https://mercury-marketing.pages.dev/https://mercury-marketing.pages.dev/blog/rebuilding-mercury/https://mercury-marketing.pages.dev/blog/rebuilding-mercury/A brutally honest post-mortem of the Mercury web rebuild — three apps, one design system, and the parts we still regret.Mon, 03 Aug 2026 00:00:00 GMT