Description:
------------
The FILTER_VALIDATE_EMAIL filter does not work as it should. If you include an IP address in your email address it filters as not valid.

The email we use for this experiment is php@[123.456.789.0], a fully valid email address. We also tested php@123.456.789.0 and its validates as FALSE.

Test script:
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<?php

$emailwithip = "php@[123.456.789.0]";

if(!filter_var($emailwithip, FILTER_VALIDATE_EMAIL)) {
	echo "EMAIL INVALID"; //Unexpected Result
} else {
	echo "EMAIL VALID"; //Expected Correct Result
}
  
?> 

Expected result:
----------------
TRUE

Actual result:
--------------
FALSE