Verify if an e-mail address is valid or not. The API verifies the syntax and checks also if the specified domain exists or not in real time. In this way it is not necessary to send a confirmation email to the destination address.

    
    

Validate your email addresses
in real time.

The syntax check is made to be sure that the provided address respects the standard for the e-mail addresses. In particular it verifies if the specified address has a domain starting with the @ symbol and a first part specifying the recipient.

The domain of the specified e-mail address is actively checked via a DNS request to verify if it exists or not. This validation is done in realtime; in this way you always have the latest available data.

Every invocation of this API has a very low response time: we measured it and the system could need from 100 to 600 milliseconds to provide the response. Only some rare cases needed 1 complete second to handle the request.

Security is a priority on SFour. All the data to and from our systems are encrypted with 256-bit SSL algorithms (HTTPS).

FREE

0
no card
required!
  • 100 requests/month
  • 1 request/second

BASIC

4
per
month
  • 100 requests/month
  • 1 request/second
  • Commercial use allowed

PRO

7
per
month
  • 5,000 requests/month
  • 50 requests/second
  • Commercial use allowed

PRO

38
per
month
  • 50,000 requests/month
  • 500 requests/second
  • Commercial use allowed
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Easy implementation Speed and scale Uptime and reliability

You're a bit EARLY

We’re not quite ready yet, but you can join our Early Birds waitlist and be among the first to gain access. For free.

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