#include <WinDNS.h>

vector<string> get_mx_ns_records( const char* email_name )
{
    vector<string> result;
    if( email_name == NULL || strlen(email_name) <  3  )
    {
        return result;
    }
    DNS_RECORD *pRecordList = NULL;
    char *dominio = strtok( (char *)email_name, "@" );
    dominio = strtok( NULL, "@" );

    // Send the DNS query... 
    if( NOERROR == DnsQuery_A( dominio, DNS_TYPE_MX, DNS_QUERY_STANDARD, NULL, &pRecordList, NULL) )
    {
        // get the MX record
        for( DNS_RECORD *pRecord = pRecordList; pRecord != NULL; pRecord = pRecord->pNext ) 
        {
            if( pRecord->wType == DNS_TYPE_MX || pRecord->wType == DNS_TYPE_NS )
            {
                char *mx_record = (char *)pRecord->Data.MX.pNameExchange;
                if( mx_record )
                {
                    // try to resolve it
                    struct hostent *host = gethostbyname( mx_record );
                    if( host != NULL )
                    {
                        result.push_back( mx_record );                    }
                }
            }
        }
    }
    DnsRecordListFree( pRecordList, DnsFreeRecordList );

    return result;
}