(.NET Core C#) GMail SMTP port 587 with "less secure" Password Authentication

Send email using GMail's SMTP server on port 587 (SSL via STARTTLS).

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

Chilkat.MailMan mailman = new Chilkat.MailMan();
bool success;

// Use the GMail SMTP server
// This example assumes your GMail account allows for "less secure apps" to use 
// SMTP username/password authentication.
// For OAuth2 authentication, see GMail SMTP with OAuth2 Authentication
mailman.SmtpHost = "smtp.gmail.com";
mailman.SmtpPort = 587;
mailman.StartTLS = true;

// Set the SMTP login/password.
mailman.SmtpUsername = "chilkat.support";
mailman.SmtpPassword = "myPassword";

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

email.Subject = "This is a test";
email.Body = "This is a test";
email.From = "Chilkat Support <chilkat.support@gmail.com>";
email.AddTo("Chilkat","support@chilkatsoft.com");

success = mailman.SendEmail(email);
if (success != true) {
    Debug.WriteLine(mailman.LastErrorText);
    return;
}

Debug.WriteLine("Email sent.");