Email Validation API can verify whether the email address is valid, properly formatted, and really exists. This API works as SMTP Server: MX-Records are extracted from a DNS Server, then the tool connects to SMTP servers and simulates the sending of a message. It does not require a response from the owner of the email address. These accuracy results for some domains can't verify that the email address is good or not, because their mail servers don't cooperate. It is very simple to use the the API to validate emails.