B4X Requires Chilkat v11.0.0+

POP3 Verify Signed (S/MIME) Email

Demonstrates how to download and verify digitally signed S/MIME email. B4X

Dim success As Boolean = False

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

Dim mailman As ChilkatMailMan
mailman.Initialize("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 ChilkatStringTable
stUidls.Initialize
success = mailman.FetchUidls(stUidls)
If success = False Then
    Log(mailman.LastErrorText)
    Return
End If


Dim email As ChilkatEmail
email.Initialize
Dim cert As ChilkatCert
cert.Initialize("cert")

Dim count As Int = stUidls.Count
Dim i As Int = 0
Do While i < count
    '  Download the full email.
    success = mailman.FetchByUidl(stUidls.StringAt(i), False, 0, email)
    If success = False Then
        Log(mailman.LastErrorText)
        Return
    End If


    Log(i)
    Log("From: " & email.From)
    Log("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

        Log("This email was signed.")

        '  Check to see if the signatures were verified.
        If email.SignaturesValid = True Then
            Log("Digital signature(s) verified.")
            Log("Signer: " & email.SignedBy)

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


            Log("Signing cert: " & cert.SubjectCN)
        End If


    Else
        Log("Digital signature verification failed.")
    End If


    i = i + 1
Loop

mailman.Pop3EndSession