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1

Get an API key

Sign up at validate.al. Your API key is shown after signup and in the portal under Settings → API Key.
2

Send a request

Send a POST with the address in a JSON body and your key in the X-API-Key header:
3

Read the result

status is true when the mail server accepts the address and false when it refuses it. A text value means no verdict could be reached: see Results.
Set a client timeout of at least 15 seconds. A check waits for the recipient’s mail server, which can take up to about 10 seconds.