email domain check in Windows

moogle1979

Here is what I have so far

function email_valid($fieldname){
	$field_errors = array();	
 	if (!preg_match('/^([a-zA-Z0-9]+)([a-zA-Z0-9\._-]*)@([a-zA-Z0-9_-]+)([a-zA-Z0-9\._-]+)+$/' , $fieldname)){  

  		$field_errors[] = $fieldname . " is not a valid email";

}else {
	list($userName, $mailDomain) = split("@", $fieldname);
	if (dns_check_record($mailDomain, "MX")){
		$field_errors[] = $mailDomain . " is not a real Domain";
	}
}
return $field_errors;
}

However dns check record, getmxrr, and checkdnsrr I have tried and none works I get the error invalid function being called and did not know what it was until I found out these do not work on a Windows platform. I need one that will work on all platforms. Can someone help me here?

NogDog

There are some users' comments on the [man]checkdnsr/man page that provide replacement functions you might look at.

In any case, if you are using this to validate email addresses, please be aware that any such look-up is likely to return false negatives for some perfectly valid email addresses due to possible security/privacy settings on the mail servers; so be careful about making life too difficult on users whose email addresses do not check out via such a method.

moogle1979

Well instead of doing that I was thinking of having an activation email sent to them to active the account but I would not know how to exactly set that up so I went to checking for proper email form and then checking for proper domain, which as you can tell I am trying to figure out now.