ZeroBounce

ZeroBounce is one of the best known email verification services, used by more than 650,000 customers according to the company. It checks addresses in bulk or in real time through its API, and flags invalid, disposable, spam trap, abuse and catch-all addresses before they hurt your sender reputation.

Beyond a simple valid or invalid verdict, ZeroBounce offers AI email scoring, which rates how likely an address is to engage, and that helps when you need to decide whether to send to catch-all or risky contacts. There is also an email finder and a set of deliverability tools. One credit covers one validation or one score, an email finder lookup costs 20 credits, and unknown results cost nothing.

For cold email teams, ZeroBounce is a safe default for cleaning scraped or purchased lists before loading them into a sending tool, and its free monthly credits make it easy to spot check small lists.

The free plan gives 100 validations a month when you sign up with a business domain. Pay-as-you-go credits start at $39 for 2,000, and the ZeroBounce ONE subscription starts at $99 a month for 10,000 credits, or less billed annually.