(Swift 3,4,5...) SMTP XOAUTH2 Authentication

Demonstrates how to authenticate using an OAuth2 access token. This example assumes you have already obtained the access token and now wish to use it in an SMTP session.

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

    var success: Bool
    var oauth2_access_token: String? = "some_previously_obtained_token"

    let mailman = CkoMailMan()!

    // Set the properties for the SMTP server, whatever they may be..
    mailman.smtpHost = "smtp.example.com"
    mailman.smtpPort = 587
    mailman.startTLS = true

    mailman.smtpUsername = "myLogin"
    mailman.oAuth2AccessToken = oauth2_access_token

    // Create a new email object
    let email = CkoEmail()!

    email.subject = "This is a test"
    email.body = "This is a test"
    email.from = "Joe Example <joe@example.com>"
    email.add(to: "Chilkat Admin", emailAddress: "admin@chilkatsoft.com")

    // Connect to the server indicated by the SmtpHost property
    success = mailman.smtpConnect()
    if success != true {
        print("\(mailman.lastErrorText!)")
        return
    }

    // Authenticate using XOAUTH2 (using the OAuth2AccessToken)
    success = mailman.smtpAuthenticate()
    if success != true {
        print("\(mailman.lastErrorText!)")
        return
    }

    success = mailman.send(email)
    if success != true {
        print("\(mailman.lastErrorText!)")
        return
    }

    print("Email sent.")

    mailman.closeSmtpConnection()

}