If you're not using the Zend Framework in your project then you can still use the email address validator; the beauty of the Zend Framework is you can pick and choose what you want to use.
All you need to do is download it and extract it to some location and then add that location to your include path.
In this tutorial, we can easily check email address is exists or not using Kickbox API makes it easy to verify your email lists, or integrate email verification into your application with their API. You need to Create a Verification App to generate an API key.
Kickbox verifies email addresses using the Simple Mail Transfer Protocol (SMTP). I created the app with the name called “ function get_curl($url) $apikey = "your api key"; $email = "[email protected]"; $url = 'https://api.kickbox.io/v2/verify?
However if the server your website is being hosted on has an earlier version of PHP then you can't use filter_var().
This post looks at how to use the Zend Framework to validate email addresses instead, if you are using the Zend Framework.
You should not be validating emails with regular expressions.
Simply put: The vast majority of regex snippets on the Internet are incorrect.
This code can be on the server and called on AJAX when user tabs out of the email field.