C

Office365 Send Email using SMTP with OAuth2 Authentication

See more Office365 Examples

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

#include <C_CkJsonObject.h>
#include <C_CkMailMan.h>
#include <C_CkEmail.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkJsonObject jsonToken;
    HCkMailMan mailman;
    HCkEmail email;

    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.
    jsonToken = CkJsonObject_Create();
    success = CkJsonObject_LoadFile(jsonToken,"qa_data/tokens/office365.json");

    mailman = CkMailMan_Create();

    CkMailMan_putSmtpHost(mailman,"smtp.office365.com");
    CkMailMan_putSmtpPort(mailman,587);
    CkMailMan_putStartTLS(mailman,TRUE);

    //  Use your Office365 email address for the SmtpUsername.
    CkMailMan_putSmtpUsername(mailman,"OFFICE365_EMAIL_ADDRESS");
    CkMailMan_putOAuth2AccessToken(mailman,CkJsonObject_stringOf(jsonToken,"access_token"));

    //  Create a new email object
    email = CkEmail_Create();

    CkEmail_putSubject(email,"This is a test");
    CkEmail_putBody(email,"This is a test");
    CkEmail_putFrom(email,"MY_NAME <OFFICE365_EMAIL_ADDRESS>");
    success = CkEmail_AddTo(email,"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 = CkMailMan_SendEmail(mailman,email);
    if (success != TRUE) {
        printf("%s\n",CkMailMan_lastErrorText(mailman));
        CkJsonObject_Dispose(jsonToken);
        CkMailMan_Dispose(mailman);
        CkEmail_Dispose(email);
        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 = CkMailMan_CloseSmtpConnection(mailman);
    if (success != TRUE) {
        printf("Connection to SMTP server not closed cleanly.\n");
    }

    printf("Mail Sent!\n");


    CkJsonObject_Dispose(jsonToken);
    CkMailMan_Dispose(mailman);
    CkEmail_Dispose(email);

    }