Email verification API: what it is and how to integrate one
An email verification API checks an address over SMTP and returns a verdict your code can act on. Here is the request, the JSON response, and working examples in curl, Node.js and Python.
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Deliverability, explained.
Guides and research on email verification, bounce rates, catch-all domains, disposable addresses, list hygiene and sender reputation. Written by the people who run the engine.
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@MX records explained: how mail finds its way to a domain
An MX record names the servers that accept mail for a domain. We cover priority values, a sample dig output, what Google, Microsoft 365 and Proton records look like, null MX and what a broken MX means for verification.
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