VB.NET

Add a PFX Source to MailMan for Decryption

Demonstrates the Chilkat MailMan.AddPfxSourceFile method, which adds a PFX/PKCS#12 file to the MailMan object's internal list of sources used for locating certificates and private keys — for example, to decrypt S/MIME email downloaded from the server. The second argument is the PFX password. This example configures a POP3 connection and registers a PFX source.

Background: When MailMan downloads an encrypted (S/MIME) message, it needs the recipient's private key to decrypt it. On Windows and macOS the OS certificate stores are searched automatically, but when the key lives in a standalone PFX file — common on Linux or in server deployments — AddPfxSourceFile tells MailMan where to find it. A PFX bundles the certificate and its private key in one password-protected file.

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Dim success As Boolean = False

'  Demonstrates the MailMan.AddPfxSourceFile method, which adds a PFX/PKCS#12 file to the
'  MailMan object's internal list of sources used for locating certificates and private
'  keys (for example, to decrypt downloaded S/MIME email).  The 2nd argument is the PFX
'  password.

Dim mailman As New Chilkat.MailMan

'  Configure the POP3 server connection.
mailman.MailHost = "pop.example.com"
mailman.MailPort = 995
mailman.PopSsl = True
mailman.PopUsername = "user@example.com"
mailman.PopPassword = "myPassword"

'  Provide a PFX so that encrypted emails downloaded from the server can be decrypted.

success = mailman.AddPfxSourceFile("qa_data/certs/decryption.pfx","pfx_password")
If (success = False) Then
    Debug.WriteLine(mailman.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("Added the PFX certificate/private-key source.")

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