Mailio

The smtp class is used for the plain TCP connections, meaning that all the traffic can be monitored. In order to encrypt connections, one must use the smtps. It inherits all features from the smtp but uses the TLS on top of TCP. There are three authentication methods: none, login and start tls. The first and second work in the same manner as for the smtp, but the connection itself cannot be monitored. The usual port used in this case is 465. The start tls method begins with an non-encrypted connection, before sending credentials the connection is upgraded to the TLS (by executing the STARTTLS command):

try
{
     smtps conn("smtp.server.com", 587);
     conn.authenticate("mailio@server.com", "mailiopass", smtps::auth_method_t::START_TLS);

     message msg;
     msg.from(mail_address("mailio library", "mailio@server.com"));
     msg.add_recipient(mail_address("mailio library", "mailio@server.com"));
     msg.subject("Salut, tout le monde!");
     msg.content("Hello, World!");

     conn.submit(msg);
 }
 catch (smtp_error& exc)
 {
     cout << exc.what() << endl;
 }
 catch (dialog_error& exc)
 {
     cout << exc.what() << endl;
 }