Validate email syntax and MX, detect disposable/role addresses, suggest typo fixes.
Email Validator by LifeStep API is a free Email API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.

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Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Validate email addresses
Send a test message and get a spam score, 41 checks with RFC citations and a fix plan
Yes. The Email Validator by LifeStep API is listed in the Email category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The Email Validator by LifeStep API requires no authentication, so you can start making requests without signing up.
Yes. The Email Validator by LifeStep API supports CORS, so front-end JavaScript can call it directly.
Yes. The Email Validator by LifeStep API is served over HTTPS, so it's safe to use in production.