PHP - email validation - MX / A check

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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 (current being 5.29).  suggestions make easy?

is familiar technique validate emails?



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