How reverse email lookup actually works
Three layers: a 275M+ contact graph stitched from licensed B2B sources and public profile data; an identity-resolution layer that merges every fingerprint of the same person — handle, photo, employer, history — into one record; and a real-time SMTP+MX verification step that confirms the address is deliverable today. Quality of all three layers determines whether you get the right answer or a confident-looking wrong one.