Hunter, made by Hunter Web Services, Inc., is an email outreach platform for B2B sales (sales from one business to another). It finds professional email addresses, verifies them and sends outreach campaigns.
Domain Search lists the known email addresses at a company's domain, and Email Finder finds the address of one named person. The Email Verifier takes one address, a list or calls from a CRM or API. It checks the format, flags disposable and webmail addresses, looks up the domain's MX records (the DNS entries that name a domain's mail servers) and runs a live check against its SMTP server, the server that accepts mail. The result is a status: valid, accept-all, invalid, disposable or unknown. An accept-all domain accepts mail for any name, so its addresses cannot be confirmed. Sequences sends cold email campaigns from connected mailboxes. Hunter also works through a browser extension, a Google Sheets add-on, CRM integrations, an API and an MCP server for AI agents.
Hunter is a hosted subscription service paid with monthly credits: one credit per email found, half a credit per email verified. A free plan exists.