Use a PEM TLS Client Certificate

See more SMTP Examples

Demonstrates the Chilkat MailMan.SetSslClientCertPem method, which sets the client-side certificate for SSL/TLS connections, loading it from PEM data or from a PEM file. The first argument may contain the PEM text itself or a path to a PEM file; the second is the PEM password. This example loads the client certificate from a PEM file.

Background: PEM is the familiar Base64 text format bracketed by -----BEGIN CERTIFICATE----- lines, and a single PEM can hold both a certificate and its (optionally encrypted) private key. It is the common format in Unix/OpenSSL environments, whereas PFX is more typical on Windows. Because this method accepts either the PEM text or a filename, you can supply credentials straight from a config value or secret store without writing them to disk.

Chilkat Go Downloads

Download Chilkat for Go

    success := false

    //  Demonstrates the MailMan.SetSslClientCertPem method, which sets the client-side
    //  certificate for SSL/TLS connections, loading it from PEM data or from a PEM file.  The
    //  1st argument may contain PEM text or a PEM file path; the 2nd is the PEM password.

    mailman := chilkat.NewMailMan()

    //  Configure the SMTP server connection.
    mailman.SetSmtpHost("smtp.example.com")
    mailman.SetSmtpPort(465)
    mailman.SetSmtpSsl(true)
    mailman.SetSmtpUsername("user@example.com")
    mailman.SetSmtpPassword("myPassword")

    //  Load the client certificate from a PEM file.
    success = mailman.SetSslClientCertPem("qa_data/certs/client.pem","pem_password")
    if success == false {
        fmt.Println(mailman.LastErrorText())
        mailman.DisposeMailMan()
        return
    }

    success = mailman.VerifySmtpLogin()
    if success == false {
        fmt.Println(mailman.LastErrorText())
        mailman.DisposeMailMan()
        return
    }

    fmt.Println("Connected using a PEM TLS client certificate.")

    //  Note: The path "qa_data/certs/client.pem" is a relative local filesystem path,
    //  relative to the current working directory of the running application.

    mailman.DisposeMailMan()