Visual Basic 6.0

Use a PFX TLS Client Certificate

Demonstrates the Chilkat MailMan.SetSslClientCertPfx method, which sets the client-side certificate for SSL/TLS connections, loading it from a PFX/PKCS#12 file. The first argument is the path to the PFX file and the second is its password. This example loads a client certificate directly from a PFX.

Background: This is the convenience form of SetSslClientCert: rather than loading a Cert object first, you point straight at the PFX file and password. A PFX (PKCS#12) bundles the certificate with its private key — exactly what mutual TLS requires, since the client must prove possession of the key during the handshake. It is the usual client-credential format on Windows.

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Visual Basic 6.0

Dim success As Long
success = 0

'  Demonstrates the MailMan.SetSslClientCertPfx method, which sets the client-side
'  certificate for SSL/TLS connections, loading it from a PFX/PKCS#12 file.  The 1st argument
'  is the PFX path and the 2nd is the PFX password.

Dim mailman As New ChilkatMailMan

'  Configure the SMTP server connection.
mailman.SmtpHost = "smtp.example.com"
mailman.SmtpPort = 465
mailman.SmtpSsl = 1
mailman.SmtpUsername = "user@example.com"
mailman.SmtpPassword = "myPassword"

'  Load the client certificate directly from a PFX file.
success = mailman.SetSslClientCertPfx("qa_data/certs/client.pfx","pfx_password")
If (success = 0) Then
    Debug.Print mailman.LastErrorText
    Exit Sub
End If

success = mailman.VerifySmtpLogin()
If (success = 0) Then
    Debug.Print mailman.LastErrorText
    Exit Sub
End If

Debug.Print "Connected using a PFX TLS client certificate."

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