(.NET Core C#) SMTP NTLM Authentication

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Demonstrates how to specify NTLM authentication for sending email via SMTP.

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

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

// Specify your particular mail server's SMTP settings.
mailman.SmtpHost = "smtp.my_mail_server.com";
mailman.SmtpPort = 587;
mailman.StartTLS = true;

// This assumes you know your SMTP server supports NTLM authentication.
// To explicitly request NTLM authentication, set the SmtpAuthMethod property = "ntlm".
mailman.SmtpAuthMethod = "ntlm";

// Note: Normally you should avoid setting the SmtpAuthMethod.
// SMTP servers tell the connecting client the authentication methods it will accept when the initial connection is made.
// Chilkat will automatically use this information to select and use the most secure auth method supported by the server.

bool useCurrentWindowsUser = true;

if (useCurrentWindowsUser == true) {
    // If you are running on Windows, and you wish for the NTLM credentials of the current logged-on Windows user to be used,
    // set the username and password to the string "default"
    mailman.SmtpUsername = "default";
    mailman.SmtpPassword = "default";
}
else {
    // Explicitly specify the SMTP username/password
    // The SMTP username is your email account username, which is often your email address.
    mailman.SmtpUsername = "your_smtp_username_or_email_address";
    mailman.SmtpPassword = "your_password";
}

Chilkat.Email email = new Chilkat.Email();

email.Subject = "This is a test";
email.Body = "This is a test";
// Don't forget to change this to use your email addresses..
email.From = "Chilkat Support <support@chilkatsoft.com>";
bool success = email.AddTo("Chilkat Admin","admin@chilkatsoft.com");
// To add more recipients, call AddTo, AddCC, or AddBcc once per recipient.

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

success = mailman.CloseSmtpConnection();
if (success != true) {
    Debug.WriteLine("Connection to SMTP server not closed cleanly.");
}

Debug.WriteLine("Mail Sent!");