#include <iostream> #include <string> #include <WinSock2.h> //适用平台 Windows using namespace std; #pragma comment(lib, "ws2_32.lib") /*链接ws2_32.lib动态链接库*/ int main() { char buff[500]; //recv函数返回的结果 string message; WSADATA wsaData; WORD wVersionRequested = MAKEWORD(2, 1); //WSAStarup，即WSA(Windows SocKNDs Asynchronous，Windows套接字异步)的启动命令 int err = WSAStartup(wVersionRequested, &wsaData); cout << "WSAStartup:" << err << endl; SOCKET sockClient; //客户端的套接字 sockClient = socket(AF_INET, SOCK_STREAM, 0); //建立socket对象 HOSTENT* pHostent; pHostent = gethostbyname("smtp.126.com"); //得到有关于域名的信息 SOCKADDR_IN addrServer; //服务端地址 addrServer.sin_addr.S_un.S_addr = *((DWORD *)pHostent->h_addr_list[0]); //得到smtp服务器的网络字节序的ip地址 addrServer.sin_family = AF_INET; addrServer.sin_port = htons(25); //连接端口25 //int connect (SOCKET s , const struct sockaddr FAR *name , int namelen ); //函数原型 err = connect(sockClient, (SOCKADDR*)&addrServer, sizeof(SOCKADDR)); //向服务器发送请求 cout << "connect:" << err << endl; buff[recv(sockClient, buff, 500, 0)] = '/0'; cout << "connect:" << buff << endl; /* 登录邮件服务器 */ message = "ehlo 126.com/r/n"; send(sockClient, message.c_str(), message.length(), 0); //发送ehlo命令 buff[recv(sockClient, buff, 500, 0)] = '/0'; //接收返回值 cout << "helo:" << buff << endl; //输出返回值 message = "auth login /r/n"; send(sockClient, message.c_str(), message.length(), 0); buff[recv(sockClient, buff, 500, 0)] = '/0'; cout << "auth login:" << buff << endl; /* 发送base64加密的用户名、密码 */ message = "xxxx/r/n"; //base64 编码的用户名 send(sockClient, message.c_str(), message.length(), 0); buff[recv(sockClient, buff, 500, 0)] = '/0'; cout << "usrname:" << buff << endl; message = "xxxx/r/n";//base64 编码的密码 send(sockClient, message.c_str(), message.length(), 0); buff[recv(sockClient, buff, 500, 0)] = '/0'; cout << "password:" << buff << endl; /* 使用 MAIL 命令指定发送者 使用 RCPT 命令指定接收者，可以重复使用RCPT指定多个接收者 */ message = "MAIL FROM:<xxxx@126.com> /r/nRCPT TO:<xxxx@126.com> /r/n"; send(sockClient, message.c_str(), message.length(), 0); buff[recv(sockClient, buff, 500, 0)] = '/0'; cout << "mail from: " << buff << endl; buff[recv(sockClient, buff, 500, 0)] = '/0'; cout << "rcpt to: " << buff << endl; /* 使用 DATA 命令告诉服务器要发送邮件内容 */ message = "DATA/r/n"; send(sockClient, message.c_str(), message.length(), 0); buff[recv(sockClient, buff, 500, 0)] = '/0'; cout << "data: " << buff << endl; message = "From: Bob@example.com/r/n/ To: Alice@example.com/r/n/ Cc: theboss@example.com/r/n/ subject: subject/r/n/r/n/ Hello Alice/r/n/ This is a test message with 4 header fields and 4 lines in the message body/r/n/ your friend/r/n/ Bob/r/n./r/n"; //注意subject关键字与正文之间要有一个空行 send(sockClient, message.c_str(), message.length(), 0); message = "QUIT/r/n"; send(sockClient, message.c_str(), message.length(), 0); buff[recv(sockClient, buff, 500, 0)] = '/0'; cout << "QUIT:" << buff << endl; system("pause"); } 
