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Use a TLS Client Certificate

Demonstrates the Chilkat MailMan.SetSslClientCert method, which sets the client-side certificate to use for SSL/TLS connections. This is typically not required — most SSL/TLS connections authenticate the server only. This example loads a client certificate from a PFX and uses it when connecting.

Background: In an ordinary TLS handshake only the server presents a certificate, and the client proves who it is later with a password. Mutual TLS adds a second leg: the client also presents a certificate, so it is authenticated cryptographically at the transport layer. Some corporate or high-security mail servers require this. Because the client must prove possession of the key, the certificate needs its private key — hence loading from a PFX.

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Local $bSuccess = False

;  Demonstrates the MailMan.SetSslClientCert method, which sets the client-side certificate
;  to use for SSL/TLS connections.  This is typically not required -- most SSL/TLS
;  connections authenticate the server only.

$oMailman = ObjCreate("Chilkat.MailMan")

;  Configure the SMTP server connection.
$oMailman.SmtpHost = "smtp.example.com"
$oMailman.SmtpPort = 465
$oMailman.SmtpSsl = True
$oMailman.SmtpUsername = "user@example.com"
$oMailman.SmtpPassword = "myPassword"

;  Load the client certificate (with its private key) from a PFX file.
$oCert = ObjCreate("Chilkat.Cert")
$bSuccess = $oCert.LoadPfxFile("qa_data/certs/client.pfx","pfx_password")
If ($bSuccess = False) Then
    ConsoleWrite($oCert.LastErrorText & @CRLF)
    Exit
EndIf

;  Use this certificate to identify the client during the TLS handshake.
$bSuccess = $oMailman.SetSslClientCert($oCert)
If ($bSuccess = False) Then
    ConsoleWrite($oMailman.LastErrorText & @CRLF)
    Exit
EndIf

$bSuccess = $oMailman.VerifySmtpLogin()
If ($bSuccess = False) Then
    ConsoleWrite($oMailman.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Connected using a TLS client certificate." & @CRLF)

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