MailboxValidator

Stop guessing which email addresses will actually reach an inbox. Put validation directly into the places where emails enter your system, and treat the results like any other data signal you act on. Start at your forms: call the API when a visitor finishes typing an address or on submit, then respond in real time. If the address fails format rules, prompt for a quick fix. If the domain has no MX records or the SMTP handshake indicates a dead mailbox, block submission and explain why. Mark addresses from temporary inbox services or known traps as high risk. When a mail host temporarily defers lookups, queue a short, automatic retry so legitimate users aren’t punished. Store the return codes (deliverable, risky, undeliverable, unknown) alongside the lead and use them to control double opt‑in, welcome flows, and sales routing.

Prepare campaigns with a batch cleanse before you hit send. Upload a CSV, map the email column, and run deep checks in one pass: format, domain health, MX presence, SMTP verification, accept‑all domains, role accounts (like sales@), duplicates, and trap‑like patterns. Review a clear breakdown of sendability and reasons, then choose actions: purge hard failures, quarantine risk, suppress roles, and tag accept‑all for separate testing. Export a polished file or sync results straight to your ESP/CRM with statuses and explanations intact. Keep an audit trail of what changed and why, so your team can justify list decisions and replicate rules next time. more