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

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

Chilkat Xojo Plugin Download Xojo Plugin for Windows, Linux, Mac OS X, and ARM

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

Dim mailman As New Chilkat.MailMan
Dim success As Boolean

// 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 = mailman.GetUidls()
If (mailman.LastMethodSuccess = False) Then
    System.DebugLog(mailman.LastErrorText)
    Return
End If

Dim email As Chilkat.Email
Dim uidl As String

Dim i As Int32
i = 0
While i < sa.Count

    uidl = sa.GetString(i)

    email = mailman.FetchEmail(uidl)
    If (mailman.LastMethodSuccess = False) Then
        System.DebugLog(mailman.LastErrorText)

        Return
    End If

    System.DebugLog(email.From)
    System.DebugLog(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)

            // The certificate used for signing may be obtained
            // by calling email.GetSignedByCert.
            Dim cert As Chilkat.Cert
            cert = email.GetSignedByCert()
            If (email.LastMethodSuccess = False) Then
                System.DebugLog("Failed to get signing certificate object.")
            Else
                System.DebugLog("Signing cert: " + cert.SubjectCN)

            End If

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

    End If

    i = i + 1
Wend

success = mailman.Pop3EndSession()