ZeroBounce is an email verification and deliverability platform used widely for list hygiene. The core job is validating lists by removing invalid, abuse, spam trap, and risky addresses, but it wraps that in a wider toolkit covering inbox placement testing, blacklist monitoring, and email activity scoring. You verify in bulk, through a real time API, or by syncing a list, then use the deliverability tools to test where mail actually lands and watch domain reputation over time. A free tier gives 100 verifications every month with no card required, and pricing runs pay as you go or as a subscription. It is the verification and deliverability layer in front of every send. Cleaner lists plus inbox placement insight protect sender reputation, which keeps an outbound system landing in the primary inbox as volume grows. ZeroBounce is one of our verify alternates alongside BounceBan and DeBounce. We run client emails through it inside our Clay enrichment waterfalls, and it is one of the most accurate verifiers we test against, so it earns a slot when data quality has to be high before a send. We also lean on the deliverability side on client domains. The blacklist and placement monitoring flags a reputation problem early, before a bad sending pattern starts dragging an entire mailbox down.