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    <p>I've written SMTP e-mail sending code using COM-CDO (on Windows); for getting email (POP3) I condensed the following code snippet as a watered-down example. If your POP3 server uses TLS/SSL, your hosed without 3rd-party software - you have to implement SSL and the code would probably take years to develop. I second the use of POCO. Here's what I have for non-SSL (sorry for any Z DIrectory calls, it should be easy to figure out):</p> <pre><code>#include &lt;winsock2.h&gt; #define MAX_MSG 40000 // max message length #define COMM_SUFF "\r\n" #define COMM_USER "USER " #define COMM_PASS "PASS " #define COMM_STAT "STAT\r\n" #define COMM_LIST "LIST\r\n" #define COMM_QUIT "QUIT\r\n" #define COMM_RETR "RETR " #define COMM_TOP "TOP " #define COMM_DELETE "DELE " #define COMM_NOOP "NOOP\r\n" SOCKET sock_no; // SOCKET no struct sockaddr_in sok = {0}; // SOCKET struct struct hostent *hp; string_o command, s, msg_num; string_o user = "EMAIL_USERNAME"; string_o passw = "EMAIL_PASSWORD"; char buff[MAX_MSG]; // pop-3 output buffer sock_no = socket (AF_INET, SOCK_STREAM, 0); // init socket sok.sin_family = AF_INET; int n_bytes = 0; // num of return bytes s = "gorth@Vettrasoft.com"; hp = gethostbyname(s.data()); // get server IP address if (hp != NULL) bcopy ((u_char *) &amp;sok.sin_addr, (const u_char *) hp-&gt;h_addr, hp-&gt;h_length); else return -1; sok.sin_port = (unsigned short int) htons(110); //.......................................................... // connect to pop-3 server and logon //.......................................................... if (::connect(sock_no, (sockaddr *) &amp;sok, sizeof (sockaddr_in)) != 0) return -1; n_bytes = ::recv (sock_no, buff, MAX_MSG, 0); // skip first server answer // send "user" command command = COMM_USER + user + COMM_SUFF; n_bytes = ::send (sock_no, command.data(), command.size(), 0); // get server answer n_bytes = ::recv (sock_no, buff, MAX_MSG, 0); // send PASS command command = COMM_PASS + passw + COMM_SUFF; n_bytes = ::send (sock_no, command.data(), command.size(), 0); n_bytes = ::recv (sock_no, buff, MAX_MSG, 0); // get server answer //.......................................................... // get list of messages; get number of messages in inbox //.......................................................... command = COMM_STAT; n_bytes = ::send (sock_no, command.data(), command.size(), 0); n_bytes = ::recv (sock_no, buff, MAX_MSG, 0); // extract number of messages msg_num = get_field(buff, "+OK "); pos = msg_num.find(' ', &amp;ie); msg_num = msg_num.substring(0, pos); count = ::z_str_to_int (msg_num.data()); //.......................................................... // do all messages from list. # of messages begins from 1 //.......................................................... for (i = 1; i &lt;= count &amp;&amp; !ie; i++) ie = process_nextmail (sock_no, i, buff, do_kill); //.......................................................... // quit and disconnect pop-3 server; send "QUIT" command //.......................................................... command = COMM_QUIT; n_bytes = ::send (sock_no, command.data(), command.size(), 0); return ::closesocket(sock_no); </code></pre>
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    1. POHow can I receive emails in C++ via POP3?
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