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c#smtpmx-record

Finding the MX Record using C#?

How can I find the MX record for a mail server in C#?

Solution

  • You can use the answer of Robert and RPK to get the MX record of a given domain.

    But you'll need a DNS server to do the job. If you want to detect the DNS server of the machine where your code is executed, you can use the following.

    NetworkInterface[] adapters = NetworkInterface.GetAllNetworkInterfaces();
foreach (NetworkInterface adapter in adapters)
{
    IPInterfaceProperties properties = adapter.GetIPProperties();

    if (properties.DnsAddresses.Count > 0)
        foreach (IPAddress ipAddress in properties.DnsAddresses)
             dnsServers.Add(ipAddress.ToString(), 53);
}

    There is a complete solution (or at github here) that will do the whole job if you don't want to rewrite everything. Look for GetMxRecords static method.