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VB.NET UWP/WinRT Examples

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(VB.NET UWP/WinRT) POP3 Verify Signed (S/MIME) Email

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

Chilkat Universal Windows Platform (UWP) / WinRT Downloads

Chilkat for the Universal Windows Platform (UWP)

Dim mailman As New Chilkat.MailMan

'  Any string argument automatically begins the 30-day trial.
Dim success As Boolean = mailman.UnlockComponent("30-day trial")
If (success <> True) Then
    Debug.WriteLine(mailman.LastErrorText)
    Exit Sub
End If


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

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

Dim sa As Chilkat.StringArray

sa = Await mailman.GetUidlsAsync()
If (sa Is Nothing ) Then
    Debug.WriteLine(mailman.LastErrorText)
    Exit Sub
End If

Dim i As Integer
Dim n As Integer = sa.Count

Dim email As Chilkat.Email
Dim uidl As String

For i = 0 To n - 1

    uidl = sa.GetString(i)

    email = Await mailman.FetchEmailAsync(uidl)
    If (email Is Nothing ) Then
        Debug.WriteLine(mailman.LastErrorText)

        Exit Sub
    End If

    Debug.WriteLine(email.From)
    Debug.WriteLine(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

        Debug.WriteLine("This email was signed.")

        '  Check to see if the signatures were verified.
        If (email.SignaturesValid = True) Then
            Debug.WriteLine("Digital signature(s) verified.")

            Debug.WriteLine("Signer: " & email.SignedBy)

            '  The certificate used for signing may be obtained
            '  by calling email.GetSignedByCert.
            Dim cert As Chilkat.Cert
            cert = email.GetSignedByCert()
            If (cert Is Nothing ) Then
                Debug.WriteLine("Failed to get signing certificate object.")
            Else
                Debug.WriteLine("Signing cert: " & cert.SubjectCN)

            End If


        Else
            Debug.WriteLine("Digital signature verification failed.")
        End If


    End If


Next



success = Await mailman.Pop3EndSessionAsync()

 

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