C++发邮件简单实例详解

C++发邮件用的是阻塞式socket模型，发送完数据后需要接收返回值，才能接着发送。

本程序不发送邮件附件，发附件的实例：C++实现含附件的邮件发送功能

#include   
#include   
#include  //适用平台 Windows 
using namespace std; 
#pragma comment(lib, "ws2_32.lib")   
 
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)] = ''; 
 cout << "connect:" << buff << endl; 
  
 message = "ehlo 126.comrn"; 
 send(sockClient, message.c_str(), message.length(), 0); //发送ehlo命令 
 buff[recv(sockClient, buff, 500, 0)] = '';   //接收返回值 
 cout << "helo:" << buff << endl;     //输出返回值 
 
 message = "auth login rn"; 
 send(sockClient, message.c_str(), message.length(), 0); 
 buff[recv(sockClient, buff, 500, 0)] = ''; 
 cout << "auth login:" << buff << endl; 
  
 message = "xxxxrn"; //base64 编码的用户名 
 send(sockClient, message.c_str(), message.length(), 0); 
 buff[recv(sockClient, buff, 500, 0)] = ''; 
 cout << "usrname:" << buff << endl; 
 
 message = "xxxxrn";//base64 编码的密码 
 send(sockClient, message.c_str(), message.length(), 0); 
 buff[recv(sockClient, buff, 500, 0)] = ''; 
 cout << "password:" << buff << endl; 
  
 message = "MAIL FROM: rnRCPT TO: rn"; 
 send(sockClient, message.c_str(), message.length(), 0); 
 
 buff[recv(sockClient, buff, 500, 0)] = ''; 
 cout << "mail from: " << buff << endl; 
 buff[recv(sockClient, buff, 500, 0)] = ''; 
 cout << "rcpt to: " << buff << endl; 
  
 message = "DATArn"; 
 send(sockClient, message.c_str(), message.length(), 0); 
 buff[recv(sockClient, buff, 500, 0)] = ''; 
 cout << "data: " << buff << endl; 
 message = "From: Bob@example.comrn 
To: Alice@example.comrn 
Cc: theboss@example.comrn 
subject: subjectrnrn 
Hello Alicern 
This is a test message with 4 header fields and 4 lines in the message bodyrn 
your friendrn 
Bobrn.rn"; //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 = "QUITrn"; 
 send(sockClient, message.c_str(), message.length(), 0); 
 buff[recv(sockClient, buff, 500, 0)] = ''; 
 cout << "QUIT:" << buff << endl; 
 system("pause"); 
} 

邮件效果图

Telnet做个对比

邮箱的用户名和密码用base64加密

可以用这个网站在线加密，工具地址

dos中登陆smtp服务器的命令

126邮箱：telnet smtp.126.com 25

qq邮箱：telnet smtp.qq.com 25

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