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邮件发送，c++实现smtp发送邮件，支持ssl的465端口发送
2025-09-21 08:08:54
来源：互联网转载
前言
c++实现smtp发送邮件，支持ssl的465端口发送，支持附件、一次发送多人、抄送等。
这里只使用了库（用来支持ssl的465端口），其他部分是原生c++,支持在win/linux运行。
网上很多都是原始的支持25端口，明文发送，这里介绍一下ssl思路
实现思路
使用编程和ssl，使用SMTP协议。
使用了c++的多态语言特性，包括重载和虚函数。
文中给出mail.h 和mail.cpp 以及main.cpp部分测试代码
Linux安装
sudo apt -dev
win下自行下载安装
SMTP协议简介 SMTP协议的定义：
1、SMTP 是一种TCP协议支持的提供可靠且有效电子邮件传输的应用层协议；
2、SMTP 是建立在 TCP上的一种邮件服务，主要用于传输系统之间的邮件信息并提供来信有关的通知；
3、SMTP 独立于特定的传输子系统，且只需要可靠有序的数据流信道支持；
4、SMTP 重要特性之一是其能跨越网络传输邮件，即“ SMTP 邮件中继”；
5、SMTP是一个相对简单的基于文本的协议。
SMTP基本命令
SMTP基本命令包括以下几个：HELO﹑EHLO、MAIL﹑RCPT﹑DATA、AUTH LOGIN和QUIT
1、HELO–发件方问候收件方，后面是发件人的服务器地址或标识。收件方回答OK时标识自己的身份。问候和确认过程表明两台机器可以进行通信，同时状态参量被复位，缓冲区被清空。
EHLO–申明身份，表示自己身份需要验证，注意这部分需要通过验证一下，是还是user，否则会出错。
2、MAIL–这个命令用来开始传送邮件，它的后面跟随发件方邮件地址（返回邮件地址）。它也用来当邮件无法送达时，发送失败通知。为保证邮件的成功发送，发件方的地址应是被对方或中间转发方同意接受的。这个命令会清空有关的缓冲区，为新的邮件做准备。
3、RCPT –这个命令告诉收件方收件人的邮箱。当有多个收件人时，需要多次使用该命令RCPT
4、TO，每次只能指明一个人。如果接收方服务器不同意转发这个地址的邮件，它必须报550错误代码通知发件方。如果服务器同意转发，它要更改邮件发送路径，把最开始的目的地（该服务器）换成下一个服务器。
5、DATA–收件方把该命令之后的数据作为发送的数据。数据被加入数据缓冲区中，以单独一行是”.”的行结束数据。结束行对于接收方同时意味立即开始缓冲区内的数据传送，传送结束后清空缓冲区。如果传送接受，接收方回复OK。
6、QUIT–SMTP要求接收放必须回答OK，然后中断传输；在收到这个命令并回答OK前，收件方不得中断连接，即使传输出现错误。发件方在发出这个命令并收到OK答复前，也不得中断连接。
7、AUTH LOGIN–登录邮箱，这一部分一般要用加密。
头文件mail.h
#pragma once#include #include #include 实现文件mail.cpp
#ifdef WIN32#include #endif#include "mail.h"#include #include #include #include #include #include #ifdef WIN32#include #include #pragma comment(lib, "ws2_32.lib")#else #include #include #include /* See NOTES */#include #define INVALID_SOCKET -1#endiftemplate<typename T>std::string join(T& vecData, const std::string& delim){ if (vecData.size() <= 0) { return std::string(); } std::stringstream ss; for (auto& item : vecData) { ss << delim << item ; } return ss.str().substr(delim.length());}const ｃｈａｒ MimeTypes[][2][128] ={ { "***", "application/octet-stream" }, { "csv", "text/csv" }, { "tsv", "text/tab-separated-values" }, { "tab", "text/tab-separated-values" }, { "html", "text/html" }, { "htm", "text/html" }, { "doc", "application/msword" }, { "docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document" }, { "ods", "application/x-vnd.oasis.opendocument.spreadsheet" }, { "odt", "application/vnd.oasis.opendocument.text" }, { "rtf", "application/rtf" }, { "sxw", "application/vnd.sun.xml.writer" }, { "txt", "text/plain" }, { "xls", "application/vnd.ms-excel" }, { "xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" }, { "pdf", "application/pdf" }, { "ppt", "application/vnd.ms-powerpoint" }, { "pps", "application/vnd.ms-powerpoint" }, { "pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation" }, { "wmf", "image/x-wmf" }, { "atom", "application/atom+xml" }, { "xml", "application/xml" }, { "json", "application/json" }, { "js", "application/javascript" }, { "ogg", "application/ogg" }, { "ps", "application/postscript" }, { "woff", "application/x-woff" }, { "xhtml","application/xhtml+xml" }, { "xht", "application/xhtml+xml" }, { "zip", "application/zip" }, { "gz", "application/x-gzip" }, { "rar", "application/rar" }, { "rm", "application/vnd.rn-realmedia" }, { "rmvb", "application/vnd.rn-realmedia-vbr" }, { "swf", "application/x-shockwave-flash" }, { "au", "audio/basic" }, { "snd", "audio/basic" }, { "mid", "audio/mid" }, { "rmi", "audio/mid" }, { "mp3", "audio/mpeg" }, { "aif", "audio/x-aiff" }, { "aifc", "audio/x-aiff" }, { "aiff", "audio/x-aiff" }, { "m3u", "audio/x-mpegurl" }, { "ra", "audio/vnd.rn-realaudio" }, { "ram", "audio/vnd.rn-realaudio" }, { "wav", "audio/x-wave" }, { "wma", "audio/x-ms-wma" }, { "m4a", "audio/x-m4a" }, { "bmp", "image/bmp" }, { "gif", "image/gif" }, { "jpe", "image/jpeg" }, { "jpeg", "image/jpeg" }, { "jpg", "image/jpeg" }, { "jfif", "image/jpeg" }, { "png", "image/png" }, { "svg", "image/svg+xml" }, { "tif", "image/tiff" }, { "tiff", "image/tiff" }, { "ico", "image/vnd.microsoft.icon" }, { "css", "text/css" }, { "bas", "text/plain" }, { "c", "text/plain" }, { "h", "text/plain" }, { "rtx", "text/richtext" }, { "mp2", "video/mpeg" }, { "mpa", "video/mpeg" }, { "mpe", "video/mpeg" }, { "mpeg", "video/mpeg" }, { "mpg", "video/mpeg" }, { "mpv2", "video/mpeg" }, { "mov", "video/quicktime" }, { "qt", "video/quicktime" }, { "lsf", "video/x-la-asf" }, { "lsx", "video/x-la-asf" }, { "asf", "video/x-ms-asf" }, { "asr", "video/x-ms-asf" }, { "asx", "video/x-ms-asf" }, { "avi", "video/x-msvideo" }, { "3gp", "video/3gpp" }, { "3gpp", "video/3gpp" }, { "3g2", "video/3gpp2" }, { "movie","video/x-sgi-movie" }, { "mp4", "video/mp4" }, { "wmv", "video/x-ms-wmv" }, { "webm","video/webm" }, { "m4v", "video/x-m4v" }, { "flv", "video/x-flv" }};std::string fileBasename(const std::string path) { std::string filename = path.substr(path.find_last_of("/\") + 1);//解析出文件名字 return filename;}std::string getFileContents(const ｃｈａｒ *filename){ std::ifstream in(filename, std::ios::in | std::ios::binary); if (in) { std::string contents; in.seekg(0, std::ios::end); contents.resize(in.tellg()); in.seekg(0, std::ios::beg); in.read(&contents[0], contents.size()); in.close(); return(contents); } else { printf("文件读取失败:%sn",filename); return ""; }}//获取文件的后缀名 如xxx.jpg 获取的是jpgstd::string GetFileExtension(const std::string& FileName){ if (FileName.find_last_of(".") != std::string::npos) //find_last_of逆向查找在原字符串中最后一个与指定字符串（或字符）中的某个字符匹配的字符，返回它的位置。若查找失败，则返回npos。 return FileName.substr(FileName.find_last_of(".") + 1); return "";}const ｃｈａｒ* GetMimeTypeFromFileName(ｃｈａｒ* szFileExt){ for (unsigned int i = 0; i < sizeof(MimeTypes) / sizeof(MimeTypes[0]); i++) { if (strcmp(MimeTypes[i][0], szFileExt) == 0) { return MimeTypes[i][1]; } } return MimeTypes[0][1]; //if does not match any, "application/octet-stream" is returned}ｃｈａｒ* base64Encode(ｃｈａｒ const* origSigned, unsigned origLength){ static const ｃｈａｒ base64Char[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; unsigned ｃｈａｒ const* orig = (unsigned ｃｈａｒ const*)origSigned; // in case any input bytes have the MSB set if (orig == NULL) return NULL; unsigned const numOrig24BitValues = origLength / 3; bool havePadding = origLength > numOrig24BitValues * 3; bool havePadding2 = origLength == numOrig24BitValues * 3 + 2; unsigned const numResultBytes = 4 * (numOrig24BitValues + havePadding); ｃｈａｒ* result = new ｃｈａｒ[numResultBytes + 3]; // allow for trailing '/0' // Map each full group of 3 input bytes into 4 output base-64 characters: unsigned i; for (i = 0; i < numOrig24BitValues; ++i) { result[4 * i + 0] = base64Char[(orig[3 * i] >> 2) & 0x3F]; result[4 * i + 1] = base64Char[(((orig[3 * i] & 0x3) << 4) | (orig[3 * i + 1] >> 4)) & 0x3F]; result[4 * i + 2] = base64Char[((orig[3 * i + 1] << 2) | (orig[3 * i + 2] >> 6)) & 0x3F]; result[4 * i + 3] = base64Char[orig[3 * i + 2] & 0x3F]; } // Now, take padding into account. (Note: i == numOrig24BitValues) if (havePadding) { result[4 * i + 0] = base64Char[(orig[3 * i] >> 2) & 0x3F]; if (havePadding2) { result[4 * i + 1] = base64Char[(((orig[3 * i] & 0x3) << 4) | (orig[3 * i + 1] >> 4)) & 0x3F]; result[4 * i + 2] = base64Char[(orig[3 * i + 1] << 2) & 0x3F]; } else { result[4 * i + 1] = base64Char[((orig[3 * i] & 0x3) << 4) & 0x3F]; result[4 * i + 2] = '='; } result[4 * i + 3] = '='; } result[numResultBytes] = ''; return result;}int SmtpEmail::SMTPComunicate(const EmailInfo &info){ if (Connect() != 0) { return -1; } ｃｈａｒ * buffer = new ｃｈａｒ[1000]; memset(buffer, 0, 1000); Read(buffer, 999); if (strncmp(buffer, "220", 3) != 0) // not equal to 220 { m_lastErrorMsg = buffer; return 220; } //向服务器发送ehlo std::string command = "ehlo EmailServicern"; Write(command.c_str(), command.length()); memset(buffer, 0, 1000); Read(buffer, 999); if (strncmp(buffer, "250", 3) != 0) // ehlo failed { m_lastErrorMsg = buffer; return 250; } //进行登录验证 command = "AUTH PLAIN "; std::string auth = '' + info.senderEmail + '' + info.password; command += base64Encode(auth.data(), auth.size()); command += "rn"; Write(command.c_str(), command.length()); memset(buffer, 0, 1000); Read(buffer, 999); if (strncmp(buffer, "235", 3) != 0) // login failed { m_lastErrorMsg = buffer; return 250; } //设置邮件发送者的邮箱地址 command = "mail FROM:<" + info.senderEmail + ">rn"; Write( command.c_str(), command.length()); memset(buffer, 0, 1000); Read(buffer, 999); if (strncmp(buffer, "250", 3) != 0) // not ok { m_lastErrorMsg = buffer; return 250; } //设置邮件接收者的邮箱地址 command = "RCPT TO:<" + info.recipientEmail + ">rn"; Write( command.c_str(), command.length()); memset(buffer, 0, 1000); Read( buffer, 999); if (strncmp(buffer, "250", 3) != 0) // not ok { m_lastErrorMsg = buffer; return 250; } //准备发送邮件 command = "datarn"; Write( command.c_str(), command.length()); memset(buffer, 0, 1000); Read( buffer, 999); if (strncmp(buffer, "354", 3) != 0) // not ready to receive message { m_lastErrorMsg = buffer; return 354; } command = std::move(GetEmailBody(info)); Write( command.c_str(), command.length()); memset(buffer, 0, 1000); Read(buffer, 999); if (strncmp(buffer, "250", 3) != 0) // not ok { m_lastErrorMsg = buffer; return 250; } //结束发送过程 ｄｅｌｅｔｅ buffer; Write( "quitrn", 6); DisConnect(); return 0;}std::string SmtpEmail::GetEmailBody(const EmailInfo &info){ //设定邮件的发送者名称、接收者名称、邮件主题，邮件内容。 std::ostringstream message; message << "From: =?" << info.charset << "?b?" << base64Encode(info.sender.c_str(), info.sender.length()) << "?= <" << info.senderEmail << ">rn"; std::vector<std::string> vecToList; for (auto item : info.recvList) { std::string to = "=?" + info.charset + "?b?" + base64Encode(item.second.c_str(), item.second.length()) + "?= <" + item.first + ">"; vecToList.push_back(to); } message << "To: " << join(vecToList, ",") << "rn"; message << "Subject: =?" << info.charset << "?b?" << base64Encode(info.subject.c_str(), info.subject.length()) << "?=rn"; message << "MIME-Version: 1.0rn"; if (info.ccEmail.size() > 0) { std::vector<std::string> vecCcList; for (auto item : info.ccEmail) { std::string cc = "=?" + info.charset + "?b?" + base64Encode(item.first.c_str(), item.first.length()) + "?= <" + item.second + ">"; vecCcList.push_back(cc); } message << "Cc:" << join(vecCcList, ",") << "rn"; } message << "Content-Type:multipart/mixed; boundary="Separator_ztq_000"rnrn"; message << "--Separator_ztq_000rn"; message << "Content-Type: multipart/alternative; boundary="Separator_ztq_111"rnrn"; message << "--Separator_ztq_111rn"; message << "Content-Type: " << "text/plain" << "; charset="" << info.charset << ""rn"; message << "Content-Transfer-Encoding: base64rn"; message << "rn"; //此处要加，不然邮件正文无内容 message << base64Encode(info.message.c_str(), info.message.length()); message << "rnrn"; message << "--Separator_ztq_111--rn"; //---------------------文件部分处理-------------------------------------- for (auto item : info.attachment) { std::string filename = fileBasename(item); std::string strContext = getFileContents(item.c_str()); if(strContext.empty()) { std::cerr << "请检查传入的文件路径是否正确,此路径文件添加到附件失败，不发送此文件:" << std::endl; std::cerr << item << std::endl; } else { std::string fileContext = base64Encode(strContext.c_str(), strContext.length()); std::string extension = GetFileExtension(filename); std::string mimetype = GetMimeTypeFromFileName((ｃｈａｒ*)extension.c_str()); message << "--Separator_ztq_000rn"; message << "Content-Type: " << mimetype << "; name="" << filename << ""rn"; message << "Content-Transfer-Encoding: base64rn"; message << "Content-Disposition: attachment; filename="" << filename << ""rnrn"; message << fileContext + "rnrn"; //把读取到的文件内容以二进制形式发送 } } //----------------------------------------------------------- message << "rn.rn"; return message.str();}SmtpEmail::SmtpEmail(const std::string& emailHost, const std::string& port) :m_host(emailHost), m_port(port){}SmtpEmail::~SmtpEmail(){}int SmtpEmail::Read(void* buf, int num){ return recv(m_socketfd, (ｃｈａｒ*)buf, num, 0);}int SmtpEmail::Write(const void* buf, int num){ return send(m_socketfd, (ｃｈａｒ*)buf, num, 0);}int SmtpEmail::Connect(){#ifdef WIN32 //start socket connection WSADATA wsadata; WSAStartup(MAKEWORD(2, 2), &wsadata);#endif m_socketfd = socket(AF_INET, SOCK_STREAM, 0); if (m_socketfd == INVALID_SOCKET) { m_lastErrorMsg = "Error on creating socket fd."; return -1; } addrinfo inAddrInfo = { 0 }; inAddrInfo.ai_family = AF_INET; inAddrInfo.ai_socktype = SOCK_STREAM; printf("host:%s port:%s n",m_host.c_str(), m_port.c_str()); if (getaddrinfo(m_host.c_str(), m_port.c_str(), &inAddrInfo, &m_addrinfo) != 0) // error occurs { m_lastErrorMsg = "Error on calling getadrrinfo()."; return -2; } if (connect(m_socketfd, m_addrinfo->ai_addr, m_addrinfo->ai_addrlen)) { m_lastErrorMsg = "Error on calling connect()."; return -3; } return 0;}int SmtpEmail::DisConnect(){ freeaddrinfo(m_addrinfo);#ifdef WIN32 closesocket(m_socketfd);#else close(m_socketfd);#endif return 0;}/*********************************************************************************/std::string SimpleSmtpEmail::GetEmailBody(const EmailInfo &info){ //设定邮件的发送者名称、接收者名称、邮件主题，邮件内容。 std::ostringstream message; message << "From: =?" << info.charset << "?b?" << base64Encode(info.sender.c_str(), info.sender.length()) << "?= <" << info.senderEmail << ">rn"; std::vector<std::string> vecToList; for (auto item : info.recvList) { std::string to = "=?" + info.charset + "?b?" + base64Encode(item.second.c_str(), item.second.length()) + "?= <" + item.first + ">"; vecToList.push_back(to); } message << "To: " << join(vecToList, ",") << "rn"; message << "Subject: =?" << info.charset << "?b?" << base64Encode(info.subject.c_str(), info.subject.length()) << "?=rn"; message << "MIME-Version: 1.0rn"; if (info.ccEmail.size() > 0) { std::vector<std::string> vecCcList; for (auto item : info.ccEmail) { std::string cc = "=?" + info.charset + "?b?" + base64Encode(item.first.c_str(), item.first.length()) + "?= <" + item.second + ">"; vecCcList.push_back(cc); } message << "Cc:" << join(vecCcList, ",") << "rn"; } message << "Content-Type:multipart/mixed; boundary="Separator_ztq_000"rnrn"; message << "--Separator_ztq_000rn"; message << "Content-Type: multipart/alternative; boundary="Separator_ztq_111"rnrn"; message << "--Separator_ztq_111rn"; message << "Content-Type: " << "text/plain" << "; charset="" << info.charset << ""rn"; message << "Content-Transfer-Encoding: base64rn"; message << "rn"; //此处要加，不然邮件正文无内容 message << base64Encode(info.message.c_str(), info.message.length()); message << "rnrn"; message << "--Separator_ztq_111--rn"; //---------------------文件部分处理-------------------------------------- for (auto item : info.attachment) { std::string filename = fileBasename(item); std::string strContext = getFileContents(item.c_str()); if(strContext.empty()) { std::cerr << "请检查传入的文件路径是否正确,此路径文件添加到附件失败，不发送此文件:" << std::endl; std::cerr << item << std::endl; } else { std::string fileContext = base64Encode(strContext.c_str(), strContext.length()); std::string extension = GetFileExtension(filename); std::string mimetype = GetMimeTypeFromFileName((ｃｈａｒ*)extension.c_str()); message << "--Separator_ztq_000rn"; message << "Content-Type: " << mimetype << "; name="" << filename << ""rn"; message << "Content-Transfer-Encoding: base64rn"; message << "Content-Disposition: attachment; filename="" << filename << ""rnrn"; message << fileContext + "rnrn"; //把读取到的文件内容以二进制形式发送 } } //----------------------------------------------------------- message << "rn.rn"; return message.str();}/***************************************************************************************************/SslSmtpEmail::~SslSmtpEmail(){}int SslSmtpEmail::Connect(){ if (SmtpEmail::Connect() == 0) { SSL_library_init(); OpenSSL_add_all_algorithms(); SSL_load_error_strings(); m_ctx = SSL_CTX_new(SSLv23_client_method()); m_ssl = SSL_new(m_ctx); SSL_set_fd(m_ssl, m_socketfd); SSL_connect(m_ssl); } return 0;}int SslSmtpEmail::DisConnect(){ SSL_shutdown(m_ssl); SSL_free(m_ssl); SSL_CTX_free(m_ctx); SmtpEmail::DisConnect(); return 0;}int SmtpEmail::SendEmail(const std::string& from, const std::string& passs, const std::string& to, const std::string& subject, const std::string& strMessage){ EmailInfo info; info.charset = "UTF-8"; info.sender = from; info.password = passs; info.senderEmail = from; info.recipientEmail = to; info.recvList[to] = ""; info.subject = subject; info.message = strMessage; return SMTPComunicate(info);}int SmtpEmail::SendEmail(const std::string& from, const std::string& passs, const std::vector<std::string>& vecTo, const std::string& subject, const std::string& strMessage, const std::vector<std::string>& attachment, const std::vector<std::string>& ccList){ std::vector<std::string> recvList; recvList.ｉｎｓｅｒｔ(recvList.end(), vecTo.begin(), vecTo.end()); recvList.ｉｎｓｅｒｔ(recvList.end(), ccList.begin(), ccList.end()); for (auto& item : recvList) { EmailInfo info; info.charset = "UTF-8"; info.sender = from; info.password = passs; info.senderEmail = from;; info.recipientEmail = item; for (auto item : vecTo) { info.recvList[item] = ""; } info.subject = subject; info.message = strMessage; for (auto& item : ccList) { info.ccEmail[item] = item; } info.attachment = attachment; if (SMTPComunicate(info) != 0) { return -1; } } return 0;}int SslSmtpEmail::Read(void * buf, int num){ int ret = SSL_read(m_ssl, buf, num); return ret;}int SslSmtpEmail::Write(const void * buf, int num){ return SSL_write(m_ssl, buf, num);}std::string SimpleSslSmtpEmail::GetEmailBody(const EmailInfo &info){ //设定邮件的发送者名称、接收者名称、邮件主题，邮件内容。 std::ostringstream message; message << "From: =?" << info.charset << "?b?" << base64Encode(info.sender.c_str(), info.sender.length()) << "?= <" << info.senderEmail << ">rn"; std::vector<std::string> vecToList; for (auto item : info.recvList) { std::string to = "=?" + info.charset + "?b?" + base64Encode(item.second.c_str(), item.second.length()) + "?= <" + item.first + ">"; vecToList.push_back(to); } message << "To: " << join(vecToList, ",") << "rn"; message << "Subject: =?" << info.charset << "?b?" << base64Encode(info.subject.c_str(), info.subject.length()) << "?=rn"; message << "MIME-Version: 1.0rn"; if (info.ccEmail.size() > 0) { std::vector<std::string> vecCcList; for (auto item : info.ccEmail) { std::string cc = "=?" + info.charset + "?b?" + base64Encode(item.first.c_str(), item.first.length()) + "?= <" + item.second + ">"; vecCcList.push_back(cc); } message << "Cc:" << join(vecCcList, ",") << "rn"; } message << "Content-Type:multipart/mixed; boundary="Separator_ztq_000"rnrn"; message << "--Separator_ztq_000rn"; message << "Content-Type: multipart/alternative; boundary="Separator_ztq_111"rnrn"; message << "--Separator_ztq_111rn"; message << "Content-Type: " << "text/plain" << "; charset="" << info.charset << ""rn"; message << "Content-Transfer-Encoding: base64rn"; message << "rn"; //此处要加，不然邮件正文无内容 message << base64Encode(info.message.c_str(), info.message.length()); message << "rnrn"; message << "--Separator_ztq_111--rn"; //---------------------文件部分处理-------------------------------------- for (auto item : info.attachment) { std::string filename = fileBasename(item); std::string strContext = getFileContents(item.c_str()); if(strContext.empty()) { std::cerr << "请检查传入的文件路径是否正确,此路径文件添加到附件失败，不发送此文件:" << std::endl; std::cerr << item << std::endl; } else { std::string fileContext = base64Encode(strContext.c_str(), strContext.length()); std::string extension = GetFileExtension(filename); std::string mimetype = GetMimeTypeFromFileName((ｃｈａｒ*)extension.c_str()); message << "--Separator_ztq_000rn"; message << "Content-Type: " << mimetype << "; name="" << filename << ""rn"; message << "Content-Transfer-Encoding: base64rn"; message << "Content-Disposition: attachment; filename="" << filename << ""rnrn"; message << fileContext + "rnrn"; //把读取到的文件内容以二进制形式发送 } } //----------------------------------------------------------- message << "rn.rn"; return message.str();}测试代码 main.cpp
函数重载，支持基本的简单发送文本邮件，和支持附件、抄送、以及发给多人的发送方式，亲测能够发送成功，默认发送的编码是utf-8格式
#include #include #include "mail.h"int main(){ std::string from = "xxxx@163.com"; std::string passs ="xxxxx";//这里替换成自己的授权码 std::string to = "xxx@126.com"; std::string subject = "hello"; std::string strMessage = "test"; std::vector<std::string> vecTo; //发送列表 vecTo.push_back("xxx@126.com"); std::vector<std::string> ccList; // ccList.push_back("xxx@xxx.com.cn");//抄送列表 std::vector<std::string> attachment; attachment.push_back("mail.h"); attachment.push_back("/home/soft/Desktop/openwrt-sdk-imx6ul/1/mybuild.sh"); SmtpBase *base; SimpleSmtpEmail m_mail("smtp.163.com","25"); base = &m_mail; //base->SendEmail(from, passs, to, subject, strMessage);//普通的文本发送，明文发送 SimpleSslSmtpEmail m_ssl_mail("smtp.163.com","465"); base=&m_ssl_mail; //base->SendEmail(from, passs, to, subject, strMessage); base->SendEmail(from, passs,vecTo,subject,strMessage,attachment,ccList);//加密的发送，支持抄送、附件等 return 0;}邮箱收件箱
查看邮件头
收到的邮件
参考链接：
C++基于Smtp协议发送邮件
SMTP基本原理与C++实现向多人发送邮件
后记
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