1. Connect
Sample contacts are ready. HubSpot and Customer.io use a token or API keys you paste.
Email auditor
Open workspaceBefore the next send
Know which contacts are safe to mail.
Connect a CRM, run a ZeroBounce then BounceBan waterfall, and write one status onto each contact. This app does not send email, and it does not probe mailboxes over SMTP.
2. Audit
Free local checks run first. A credit is spent only when a verifier is called.
3. Write the field
Only email_send_status is updated. Subscription and opt-out flags stay as they are.
Only deliverable is safe to mail
| Status | Meaning | Send? |
|---|---|---|
| Deliverable | A verifier confirmed the mailbox, or you explicitly trust MX records. | Safe to mail |
| Unconfirmed | Syntax and MX look fine. The mailbox was not checked. | Hold |
| Risky | Role address, likely typo, catch-all, or implicit MX. | Hold |
| Undeliverable | Bad syntax, disposable domain, no mail host, or a vendor rejection. | Do not mail |
| Unknown | DNS failed, or a verifier could not decide. | Hold |
| Suppressed | Prior bounce, unsubscribe, or spamtrap. | Do not mail |