why not do a function in a loop for each of the emails - something like:
function mail_is_valid($email) {
// your email validator here
}
$emails= explode(",",$emails); //seperates the emails by a comma
$count= sizeof($emails); //counts how many items in array
for ($i=0;$i <$count;$i++) {
mail_is_valid($emails[$i]) // call that function above for each email
}
hope this helps!
