[POCO (class Poco::Net::SMTPException - 0): SMTP Exception: The mail service does not support XOAUTH2 authentication

[Vin745]

I am trying to send an email using OAUTH2.0 Authentication type, using Poco 1.11.0 version, but I am getting the below expectation.

Your email system reported an error sending mail. details: [POCO (class Poco::Net::SMTPException - 0): SMTP Exception: The mail service does not support XOAUTH2 authentication: 250-MA1PEPF00007263.mail.protection.outlook.com Hello [XXX.XXX.XXX.XXX]
250-SIZE 157286400
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-STARTTLS
250-8BITMIME
250-BINARYMIME
250-CHUNKING
250 SMTPUTF8]

Please review the code snippet below and let me know your thoughts.

#include
#include
#include <Poco/JSON/Parser.h>
#include "Poco/Net/MailMessage.h"
#include "Poco/Net/MailRecipient.h"
#include "Poco/Net/SMTPClientSession.h"
#include "Poco/Net/StringPartSource.h"
#include "Poco/Net/NetException.h"
#include "Poco/Net/SecureSMTPClientSession.h"
#include "Poco/Net/SslManager.h"
#include "Poco/Net/HTTPRequest.h"
#include "Poco/Net/HTTPSClientSession.h"
#include "Poco/Net/HTTPResponse.h"
#include <Poco/Net/AcceptCertificateHandler.h>
#include <Poco/Net/Context.h>

int main(int argc, char** argv)
{
string AuthToken = //Getting from other function.
string smtpHost = "Servername";
Poco::UInt16 port = 25;
try {
// Initialize SSL Context for STARTTLS
// POCO SSL initialization.
std::shared_ptr sessionPtr;

	Poco::SharedPtr<InvalidCertHandler> invalidCertHandler(new InvalidCertHandler());
	Context::Ptr contextPtr = new Context(
		Context::TLS_CLIENT_USE,
		"",
		Context::VerificationMode::VERIFY_STRICT,
		Context::OPT_PERFORM_REVOCATION_CHECK | Context::OPT_TRUST_ROOTS_WIN_CERT_STORE | Context::OPT_USE_STRONG_CRYPTO);

	contextPtr->disableProtocols(Context::PROTO_SSLV2 | Context::PROTO_SSLV3 | Context::PROTO_TLSV1 | Context::PROTO_TLSV1_1 | Context::PROTO_TLSV1_3);

	SSLManager::instance().initializeClient(nullptr, invalidCertHandler, contextPtr);

	std::shared_ptr<SecureSMTPClientSession> secureSessionPtr(new SecureSMTPClientSession(smtpHost, port));
	secureSessionPtr->login(Poco::Net::SMTPClientSession::AUTH_XOAUTH2, sender_email, AuthToken);
	secureSessionPtr->startTLS();
	sessionPtr = secureSessionPtr;
}
catch (const Poco::Exception& e)
{
	const Poco::Net::SMTPException* pSmtpExc = dynamic_cast<const Poco::Net::SMTPException*>(&e);
	if (pSmtpExc)
	{
		int errorClass = e.code() / 100;
		if (errorClass == 5)
		{
			//shouldRetry = false;
		}
	}

	string pocoMsg = e.message();
	if (pocoMsg.empty() && !pSmtpExc && e.code() != 0)
	{
		pocoMsg = e.code();
	}

	string msg = "[POCO ({0} - {1}): {2}]";
	replaceAll(msg, "{0}", e.className());
	replaceAll(msg, "{1}", to_string(e.code()));
	replaceAll(msg,"{2}", e.name() + string(": ") + pocoMsg);
	//AfxMessageBox(msg.c_str());

}

}

[matejk]

Does it work with the latest version of Poco?

[Vin745]

Did you mean the 1.14.0 version? I haven't tried it, but I can give it a try.

Poco 1.11.0 doesn't support OAuth 2.0, let me know if you have any idea.