POP3s sample using Boost::Asio

gistfile1.cpp

#include <iostream>
#include <boost/asio.hpp>
#include <boost/asio/ssl.hpp>
#include <boost/asio/ssl/stream.hpp>

void communicatePOP3(){

    const char server[] = {"pop.gmail.com"};
    const char port[]   = {"pop3s"};
    const char user[]   = {"your username"};
    const char pass[]   = {"your password"};

    boost::asio::io_service i;
    boost::asio::ssl::context c( i, boost::asio::ssl::context::sslv3_client );    
    boost::asio::ssl::stream<boost::asio::ip::tcp::socket> s(i, c);
    
    s.lowest_layer().connect( * boost::asio::ip::tcp::resolver(i)
                             .resolve( boost::asio::ip::tcp::resolver::query(server, port)  ) );
    s.handshake( boost::asio::ssl::stream_base::client );

    /*
    // pop3 without SSL
    boost::asio::io_service i;
    boost::asio::ip::tcp::socket s(i);
    boost::asio::ip::tcp::resolver resolver(i);
    boost::asio::ip::tcp::resolver::query query(server, port);
    boost::asio::ip::tcp::endpoint endpoint(*resolver.resolve(query));
    s.connect(endpoint);    
    */
     
    boost::asio::streambuf res;
    boost::system::error_code e;

    // hello
    read( s, res, boost::asio::transfer_at_least(1), e );
    std::cout << &res;    
    
    // USER Command
    std::string user_command = std::string("USER ") + user + std::string("\r\n");
    write( s, boost::asio::buffer( user_command, strlen(user_command.c_str()) ) );
    read( s, res, boost::asio::transfer_at_least(1), e );
    std::cout << &res;    

    // PASS Command
    std::string pass_command = std::string("PASS ") + pass + std::string("\r\n");
    write( s, boost::asio::buffer( pass_command, strlen(pass_command.c_str()) ) );
    read( s, res, boost::asio::transfer_at_least(1), e );
    std::cout << &res;    
    
    // STAT Command
    std::string stat_command("STAT\r\n");
    write( s, boost::asio::buffer(stat_command, strlen(stat_command.c_str()) ) );
    read( s, res, boost::asio::transfer_at_least(1), e );
    std::cout << &res;    

    // QUIT Command
    std::string quit_command("QUIT\r\n");
    write( s, boost::asio::buffer(quit_command, strlen(quit_command.c_str()) ) );
    read( s, res, boost::asio::transfer_at_least(1), e );
    std::cout << &res;    
}

Deprecated constructor is used for ssl::context. Please use boost::asio::ssl::context c( boost::asio::ssl::context::sslv3_client ); instead.