printf("连接成功\n");
        n=recv(s,name,sizeof(name),0);
        name[n]='\0';

        printf("%s\n",name);
        ZeroMemory(name,1000);
        strcpy_s(name,"HELO hi\r\n");

        if(send(s,name,sizeof(name),0)==SOCKET_ERROR)
        {
            printf("发送helo失败%d\n",WSAGetLastError());
        }
        n=recv(s,name,sizeof(name),0);
        name[n]='\0';
        if(n==SOCKET_ERROR)
        {
            printf("接收数据失败%d\n",WSAGetLastError());
        }
        printf("%s",name);

        ZeroMemory(name,1000);
        strcpy_s(name,"auth login\r\n");
        if(send(s,name,sizeof(name),0)==SOCKET_ERROR)
        {
            printf("发送auth login失败%d\n",WSAGetLastError());
        }
        n=recv(s,name,sizeof(name),0);
        name[n]='\0';
        printf("%s",name);

telnet上面一切正常，vc上面HELO成功之后所有命令都提示502错误


连接成功
220 Anti-spam GT for Coremail System (163com[20121016])

250 OK
502 Error: command not implemented
请按任意键继续. . .

求助大神