is there a sensible way to find people's emails?

for B2B outreach the usual route is the company's own site first (team page, press page), then guess the pattern (first@ or first.last@) and run it through a verifier before sending. Tools like Hunter do the same thing faster. Just keep it to work emails and stick to the anti-spam rules where you are, GDPR in particular if you're contacting people in the EU.