(Xojo Plugin) POP3 Verify Signed (S/MIME) Email

Demonstrates how to download and verify digitally signed S/MIME email.

Note: This example requires Chilkat v11.0.0 or greater.

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Dim success As Boolean
success = False

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Dim mailman As New Chilkat.MailMan

// Set the POP3 server's hostname
mailman.MailHost = "pop.example.com"

// Set the POP3 login/password.
mailman.PopUsername = "myLogin"
mailman.PopPassword = "myPassword"

Dim stUidls As New Chilkat.StringTable
success = mailman.FetchUidls(stUidls)
If (success = False) Then
    System.DebugLog(mailman.LastErrorText)
    Return
End If

Dim email As New Chilkat.Email
Dim cert As New Chilkat.Cert

Dim count As Int32
count = stUidls.Count
Dim i As Int32
i = 0
While i < count
    // Download the full email.
    success = mailman.FetchByUidl(stUidls.StringAt(i),False,0,email)
    If (success = False) Then
        System.DebugLog(mailman.LastErrorText)
        Return
    End If

    System.DebugLog(Str(i))
    System.DebugLog("From: " + email.From)
    System.DebugLog("Subject: " + email.Subject)

    // The security layers of signed and/or encrypted emails
    // are automatically "unwrapped" when loaded into
    // a Chilkat email object.
    // An application only needs to check to see if an email
    // was received signed or encrypted, and then examine
    // the success/failure.  For example:
    If (email.ReceivedSigned = True) Then

        System.DebugLog("This email was signed.")

        // Check to see if the signatures were verified.
        If (email.SignaturesValid = True) Then
            System.DebugLog("Digital signature(s) verified.")
            System.DebugLog("Signer: " + email.SignedBy)

            success = email.LastSignerCert(0,cert)
            If (success = False) Then
                System.DebugLog(email.LastErrorText)
                Return
            End If

            System.DebugLog("Signing cert: " + cert.SubjectCN)
        End If

    Else
        System.DebugLog("Digital signature verification failed.")
    End If

    i = i + 1
Wend

success = mailman.Pop3EndSession()