#define MAIL_HEADER_FROM_SIZE          50
#define MAIL_HEADER_TO_SIZE            50
#define MAIL_HEADER_CC_SIZE            50
#define MAIL_HEADER_SUBJECT_SIZE       50
#define MAIL_BODY_SIZE                 20
#define MAIL_LINE_SIZE                 80
#define MAIL_HEADER_MSG_ID_SIZE        50
#define MAIL_HEADER_RETURN_PATH_SIZE   50
#define MAIL_HEADER_DATE_SIZE          50

typedef struct {
   char start[MAIL_HEADER_FROM_SIZE];
   char from[MAIL_HEADER_FROM_SIZE];
   char to[MAIL_HEADER_TO_SIZE];
   char cc[MAIL_HEADER_CC_SIZE];
   char subject[MAIL_HEADER_SUBJECT_SIZE];
   char msg_id[MAIL_HEADER_MSG_ID_SIZE];
   char return_path[MAIL_HEADER_RETURN_PATH_SIZE];
   char date[MAIL_HEADER_DATE_SIZE];
} mail_header;

typedef char mail_line[MAIL_LINE_SIZE];

typedef struct {
   mail_header header;
   int line_counter;
   mail_line body[MAIL_BODY_SIZE];
} mail_message;


typedef struct {
   int msg_type;
   int data_length;
} mail_msg_header;

/* Mail messages type. */
#define MAIL_INCOMING_MAIL 1
#define MAIL_QUIT_REQUEST  2
#define MAIL_AGENT_MESSAGE 3
#define MAIL_DISPLAY_MAIL  4
#define MAIL_DELIVER_MAIL  5
#define MAIL_HOLD_MAIL     6



/* Status definitions */
#define LOOK_FOR_FROM_LINE 1
#define MAIL_BODY          2
#define MAIL_HEADER_INFO   3
#define MAIL_TO_LONG       4


/* Agent to agent communication title */
#define AGENT_TO_AGENT "UPS_AGENT_FEDEX"