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Bug #27665 checkdnsrr and getmxrr don't like zero preferenfence MX RR's
Submitted: 2004-03-23 17:32 UTC Modified: 2004-03-23 17:49 UTC
From: php-bugs at mcooper dot demon dot co dot uk Assigned:
Status: Not a bug Package: Network related
PHP Version: 4.3.4 OS: Linux
Private report: No CVE-ID: None
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From: php-bugs at mcooper dot demon dot co dot uk
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 [2004-03-23 17:32 UTC] php-bugs at mcooper dot demon dot co dot uk
The checkdnsrr and getmxrr functions don't work with domain's that only have a single zero preference MX record.

Reproduce code:
    $Domain = "";
    echo $Domain;
    // That MX(mail exchanger) record exists in domain check .
    // checkdnsrr function reference :
    if ( checkdnsrr ( $Domain, "MX" ) )  {
        echo "Confirmation : MX record about {$Domain} exists.<br>";
        // If MX record exists, save MX record address.
        // getmxrr function reference :
        if ( getmxrr ($Domain, $MXHost))  {
                echo "Confirmation : Is confirming address by MX LOOKUP.<br>";


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 [2004-03-23 17:49 UTC]
The domain you provided in your example is not registered (or if it is, it was only done recently and hasn't propagated to name servers yet, either way it's not resolvable by name name service, not just PHP).

Testing these functions with actual hostnames that contain MXs with preference of 0 returns expected results.

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