C++

Office365 Send Email using SMTP with OAuth2 Authentication

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Demonstrates how to send email from smtp.office365.com using OAuth2 authentication. C++

#include <CkJsonObject.h>
#include <CkMailMan.h>
#include <CkEmail.h>

void ChilkatSample(void)
    {
    bool success = false;

    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    //  An Office365 OAuth2 access token must first be obtained prior
    //  to running this code.

    //  Getting the OAuth2 access token for the 1st time requires the O365 account owner's 
    //  interactive authorization via a web browser.  Afterwards, the access token
    //  can be repeatedly refreshed automatically (with no user interaction).

    //  See the following examples for getting and refreshing an OAuth2 access token

    //  Get Office365 SMTP/IMAP/POP3 OAuth2 Access Token
    //  Refresh Office365 SMTP/IMAP/POP3 OAuth2 Access Token

    //  First get our previously obtained OAuth2 access token.
    CkJsonObject jsonToken;
    success = jsonToken.LoadFile("qa_data/tokens/office365.json");

    CkMailMan mailman;

    mailman.put_SmtpHost("smtp.office365.com");
    mailman.put_SmtpPort(587);
    mailman.put_StartTLS(true);

    //  Use your Office365 email address for the SmtpUsername.
    mailman.put_SmtpUsername("OFFICE365_EMAIL_ADDRESS");
    mailman.put_OAuth2AccessToken(jsonToken.stringOf("access_token"));

    //  Create a new email object
    CkEmail email;

    email.put_Subject("This is a test");
    email.put_Body("This is a test");
    email.put_From("MY_NAME <OFFICE365_EMAIL_ADDRESS>");
    success = email.AddTo("John Doe","somebody@example.com");

    //  Call SendEmail to connect to the SMTP server and send.
    //  The connection (i.e. session) to the SMTP server remains
    //  open so that subsequent SendEmail calls may use the
    //  same connection.  
    success = mailman.SendEmail(email);
    if (success != true) {
        std::cout << mailman.lastErrorText() << "\r\n";
        return;
    }

    //  If SendEmail failed because of "Failed to get initial SMTP Response", then it may be 
    //  a firewall or anti-virus blocking communications.
    //  See https://cknotes.com/smtp-office365-com-failed-to-get-initial-smtp-response/

    success = mailman.CloseSmtpConnection();
    if (success != true) {
        std::cout << "Connection to SMTP server not closed cleanly." << "\r\n";
    }

    std::cout << "Mail Sent!" << "\r\n";
    }