MX.h

#ifndef MX_INCLUDE_HEADER
#define MX_INCLUDE_HEADER

struct MX_Information
{
    std::string name;
    int            prefernce;

//    bool operator==(const std::string & str) { return Function == str; }
    bool operator<(const MX_Information& a) { return prefernce < a.prefernce; }
};

bool GetOwnMXServers(std::vector<MX_Information>& results);
bool GetMXServers(std::string server, std::vector<MX_Information>& results);

static bool    MXLookup(const char* name, std::vector<MX_Information>& results);
static bool    PtrLookup(const char* name, char* result);
static void    GenerateReverseLookupIP(const char* ip, char* result);
static char*   Get2LevelDomain(char* domain);

#define NOT_A_IP            0xFFFFFFFF
#define PTR_NAME_LENGTH     256

static bool SortMxRecords(MX_Information const& lhs, MX_Information const& rhs);
#endif // MX_INCLUDE_HEADER