When Revnox needs to find a contact's email address, it doesn't rely on a single provider. Instead it runs a waterfall: a sequential chain of enrichment providers, stopping as soon as a verified email is found.
The first lookup. Hunter indexes email patterns from public sources and is best for companies with a clear, consistent email format (e.g., firstname@company.com).
Best for: Mid-market and enterprise companies with professional domains.If Hunter returns no result, Revnox queries Apollo's database of 200M+ contacts. Apollo has strong coverage for US tech companies and startups.
Best for: Startups, tech companies, and sales/marketing roles.The final fallback. Dropcontact uses algorithmic generation and SMTP verification rather than a static database. It constructs likely email variants and verifies them in real-time.
Best for: European companies, smaller businesses, and roles not well-indexed elsewhere.Every found email is SMTP-verified before being saved, Revnox pings the mail server to confirm the address exists without sending an email. Unverified addresses are marked as "unconfirmed" and excluded from campaigns by default.
Go to Settings > Integrations to add your own API keys for Hunter, Apollo, and Dropcontact. Using your own keys means lookups count against your quotas, not Revnox's shared pool, important if you're enriching at high volume.
Each waterfall attempt counts as one credit regardless of which provider resolves it. Failed attempts (no email found) count as 0.5 credits.