Hunter

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Do not build this — and the reason is only partly that you cannot crawl the web.

**In the EU and the UK, a work email address identifying a person is personal data.** Collecting and using one without a lawful basis is not a grey area, and the fact that a product sells the database does not transfer the obligation to them. Building your own scraper for the same purpose puts you squarely on the wrong side of it, with no supplier to point at.

WHAT TO DO INSTEAD
- Keep paying if you genuinely need it, and check the rules where your prospects live before using what it returns
- Better: get the address from the person. A form, a conversation, a conference badge, a reply. An address somebody gave you is worth several that you guessed

WHAT YOU CAN BUILD, AND SHOULD

**Verification, which is the honest half and is free:**
- Syntax, then the domain's MX records, then an SMTP conversation that stops before sending anything
- **Catch-all detection matters more than the check itself**: a domain that accepts every address tells you the verification means nothing there, and a large share of company domains are catch-all
- Never run this from your sending domain. Repeated verification traffic looks exactly like a directory-harvest attack, and it is a good way to have your own mail blocked
- Rate-limit yourself hard, and treat a soft failure as unknown rather than as valid

**Pattern inference, which is arithmetic over what you already have:**
- From the addresses in your own mailbox and CRM, work out each company's format — first.last, f.last, first — and its confidence
- That covers the companies you already deal with, which is usually the list that matters

**And the thing that actually reduces bounces:** list hygiene rather than verification. Suppress hard bounces immediately, never import a list you did not build, and watch the complaint rate. That is under Lemlist and Brevo elsewhere in this catalogue.

THE ONE-LINE VERSION
The database is unbuildable and, in much of Europe, unusable without a basis. Build the verification, infer the patterns from your own mail, and get addresses from people rather than about them.