Poco failing to send mail - c++

Question

I have installed the Poco C++ library (Release 1.12.4) with vcpkg on my computer and I'm trying to send a simple Mail by using the sample delivered on the Github Page.`The script is compile with Visual Studio 17.
The full code:
#include "Poco/Net/MailMessage.h"
#include "Poco/Net/MailRecipient.h"
#include "Poco/Net/SecureSMTPClientSession.h"
#include "Poco/Net/StringPartSource.h"
#include "Poco/Net/SSLManager.h"
#include "Poco/Net/ConsoleCertificateHandler.h"
#include "Poco/Net/PrivateKeyPassphraseHandler.h"
#include "Poco/SharedPtr.h"
#include "Poco/Path.h"
#include "Poco/Exception.h"
#include <iostream>
using Poco::Net::MailMessage;
using Poco::Net::MailRecipient;
using Poco::Net::SMTPClientSession;
using Poco::Net::SecureSMTPClientSession;
using Poco::Net::StringPartSource;
using Poco::Net::SSLManager;
using Poco::Net::Context;
using Poco::Net::InvalidCertificateHandler;
using Poco::Net::ConsoleCertificateHandler;
using Poco::SharedPtr;
using Poco::Path;
using Poco::Exception;
using Poco::UInt16;
using namespace std;
class SSLInitializer
{
public:
SSLInitializer()
{
Poco::Net::initializeSSL();
}
~SSLInitializer()
{
Poco::Net::uninitializeSSL();
}
};
int main()
{
SSLInitializer sslInitializer;
std::string mailhost("smtp.office365.com");
std::string recipient("recipient#gmail.com");
std::string username("MyMail#gmail.com");
std::string password("MyPassword");
Poco:UInt16 port = 587;
try
{
// Note: we must create the passphrase handler prior Context
SharedPtr<InvalidCertificateHandler> pCert = new ConsoleCertificateHandler(false); // ask the user via console
Context::Ptr pContext = new Context(Context::CLIENT_USE, "");
SSLManager::instance().initializeClient(0, pCert, pContext);
MailMessage message;
message.addRecipient(MailRecipient(MailRecipient::PRIMARY_RECIPIENT, recipient));
message.setSubject("Hello from the POCO C++ Libraries");
std::string content;
content += "Hello ";
content += recipient;
content += ",\r\n\r\n";
content += "This is a greeting from the POCO C++ Libraries.\r\n\r\n";
message.addContent(new StringPartSource(content));
SecureSMTPClientSession session(mailhost, port);
session.login();
session.startTLS(pContext);
if (!username.empty())
{
session.login(SMTPClientSession::AUTH_LOGIN, username, password);
}
session.sendMessage(message);
session.close();
}
catch (Exception& exc)
{
std::cerr << exc.displayText() << std::endl;
return 1;
}
return 0;
}
I already tried the code on my first computer and it works. I wanted to try it on my laptop but it raises following error:
Poco::Net::NoCertificateException
and after a while:
SSL Exception: Error during handshake: failed to read data
I located the error and it comes from this line:
session.startTLS(pContext);
Thank you for helping me!
P.S: I don't use OpenSSL but NetSSL_Win, an implementation of the POCO NetSSL library based on Windows Schannel.