email validation against MX / A record


i want validate email exists without sending out confirmation email, not syntax check (looking @ , . ).

 

if you're on linux server, can use checkdnsrr check against mx or record see if domain legit.  unfortunately function isn't supported on windows server version of php until 5.3 comes out.

 

for example:

 

function verifyemailaddress($email){
        list($user, $domain) = explode("@", $email);
        $result = checkdnsrr($domain, 'mx');
        return($result);}

 

this isn't supported on windows servers. suggestions make easy validate email address real without annoying verification urls in emails people use?

well, lack of response overwhelming.  decided send out custom string url emails, else, verify email exists.  guess windows hosts php users have wait until php 5.3



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