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    <p>Here's a function that I use. It does a little more than just run the email address through a regex, but so far it is the most complete solution that I found:</p> <pre><code>function validEmail($email, $skipDNS = false) { $isValid = true; $atIndex = strrpos($email, "@"); if (is_bool($atIndex) &amp;&amp; !$atIndex) { $isValid = false; } else { $domain = substr($email, $atIndex+1); $local = substr($email, 0, $atIndex); $localLen = strlen($local); $domainLen = strlen($domain); if ($localLen &lt; 1 || $localLen &gt; 64) { // local part length exceeded $isValid = false; } else if ($domainLen &lt; 1 || $domainLen &gt; 255) { // domain part length exceeded $isValid = false; } else if ($local[0] == '.' || $local[$localLen-1] == '.') { // local part starts or ends with '.' $isValid = false; } else if (preg_match('/\\.\\./', $local)) { // local part has two consecutive dots $isValid = false; } else if (!preg_match('/^[A-Za-z0-9\\-\\.]+$/', $domain)) { // character not valid in domain part $isValid = false; } else if (preg_match('/\\.\\./', $domain)) { // domain part has two consecutive dots $isValid = false; } else if (!preg_match('/^(\\\\.|[A-Za-z0-9!#%&amp;`_=\\/$\'*+?^{}|~.-])+$/', str_replace("\\\\","",$local))) { // character not valid in local part unless // local part is quoted if (!preg_match('/^"(\\\\"|[^"])+"$/', str_replace("\\\\","",$local))) { $isValid = false; } } if(!$skipDNS) { if ($isValid &amp;&amp; !(checkdnsrr($domain,"MX") || checkdnsrr($domain,"A"))) { // domain not found in DNS $isValid = false; } } } return $isValid; } </code></pre> <p>The function has an <strong>optional $skipDNS argument</strong> that can be set to TRUE if you don't want to validate the MX records for the hos. Otherwise the function will attempt to validate that the e-mail address provided actually maps to a real email server.</p> <p>It's useful to note that most RegEx email validation techniques will validate most e-mail addresses but they will most likely allow some carefully crafted invalid addresses or worst.. fail on some more obscure, but valid e-mail addresses. For more information you may want to check out the <a href="http://tools.ietf.org/html/rfc2822" rel="noreferrer">Internet Message Formats RFC</a> which describes the allowed format for e-mail addresses.</p>
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    1. USMike Dinescu
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    1. COChecking the DNS records... nice approach!
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      1. USJason O'Neil
 

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