VB.NET

Clear the Encryption Certificates of an Email

Demonstrates the Chilkat Email.ClearEncryptCerts method, which clears the internal list of explicitly specified certificates used when sending encrypted email — the certificates previously added with AddEncryptCert or SetEncryptCert. This example adds a recipient certificate and then clears the list.

Background: When encrypting to multiple recipients you register each one's certificate with AddEncryptCert. If an Email object is reused for different sets of recipients, those registered certificates would otherwise persist. ClearEncryptCerts resets that list so the next encrypted message is protected for exactly the intended recipients — a useful safeguard against accidentally encrypting for a stale recipient.

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Dim success As Boolean = False

'  Demonstrates the ClearEncryptCerts method, which clears the internal list of explicitly
'  specified certificates used for sending encrypted email (the certificates added by
'  AddEncryptCert / SetEncryptCert).

Dim email As New Chilkat.Email

'  Add a recipient certificate to the encryption cert list...
Dim cert As New Chilkat.Cert
success = cert.LoadFromFile("qa_data/certs/recipient.cer")
If (success = False) Then
    Debug.WriteLine(cert.LastErrorText)
    Exit Sub
End If

success = email.AddEncryptCert(cert)
If (success = False) Then
    Debug.WriteLine(email.LastErrorText)
    Exit Sub
End If


'  ...then clear all explicitly-specified encryption certificates.
email.ClearEncryptCerts()

Debug.WriteLine("Cleared the explicitly-specified encryption certificates.")

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