(Java) SMTP GMail Send using App Password

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Demonstrates how to authenticate using an app password with GMail for SMTP (port 465 using implicit SSL/TLS).

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Starting May 30, 2022, Google will no longer support the use of third-party apps or devices 
    // which ask you to sign in to your Google Account using only your username and password.

    // Instead of authenticating with your GMail username/password, a GMail user can create an App Password
    // and then login using their username/app_password.   It's literally the same, except it allows a GMail
    // account owner to isolate passwords to specific applications.

    // The Gmail account owner would first need to make sure she has 2-Step Verification setup for her account.
    // Note: The 2FA verification is not a factor when authenticating with an app password. The 2FA is required
    // to setup app passwords in the Google account console.  See Sign in with App Passwords

    // After the GMail account owner has setup his app password, he simply uses the app password instead of his GMail account password.

    CkMailMan mailman = new CkMailMan();

    mailman.put_SmtpHost("smtp.gmail.com");

    mailman.put_SmtpUsername("user@gmail.com");
    mailman.put_SmtpPassword("srnyyvqajocnsvdp");

    mailman.put_SmtpSsl(true);
    mailman.put_SmtpPort(465);

    boolean success = mailman.SmtpConnect();
    if (success == false) {
        System.out.println(mailman.lastErrorText());
        return;
        }

    success = mailman.SmtpAuthenticate();
    if (success == false) {
        System.out.println(mailman.lastErrorText());
        return;
        }

    System.out.println("SMTP Success!");
  }
}