Java

Office365 Send Email using SMTP with OAuth2 Authentication

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Demonstrates how to send email from smtp.office365.com using OAuth2 authentication. Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Email;
import com.chilkatsoft.chilkat2.JsonObject;
import com.chilkatsoft.chilkat2.MailMan;

public class ChilkatExample {

    public static void main(String[] args) {
        // 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.
        JsonObject jsonToken = new JsonObject();
        jsonToken.loadFile("qa_data/tokens/office365.json");

        MailMan mailman = new MailMan();

        mailman.setSmtpHost("smtp.office365.com");
        mailman.setSmtpPort(587);
        mailman.setStartTLS(true);

        // Use your Office365 email address for the SmtpUsername.
        mailman.setSmtpUsername("OFFICE365_EMAIL_ADDRESS");
        mailman.setOAuth2AccessToken(jsonToken.stringOf("access_token"));

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

        email.setSubject("This is a test");
        email.setBody("This is a test");
        email.setFrom("MY_NAME <OFFICE365_EMAIL_ADDRESS>");
        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.
        try {
            mailman.sendEmail(email);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            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/

        try {
            mailman.closeSmtpConnection();
        } catch (ChilkatException e) {
            System.out.println("Connection to SMTP server not closed cleanly.");
        }

        System.out.println("Mail Sent!");
    }
}