(PowerShell) POP3 Verify Signed (S/MIME) Email

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

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

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

$mailman = New-Object Chilkat.MailMan

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

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

$sa = $mailman.GetUidls()
if ($mailman.LastMethodSuccess -eq $false) {
    $($mailman.LastErrorText)
    exit
}

$i = 0
while ($i -lt $sa.Count) {

    $uidl = $sa.GetString($i)

    $email = $mailman.FetchEmail($uidl)
    if ($mailman.LastMethodSuccess -eq $false) {
        $($mailman.LastErrorText)

        exit
    }

    $($email.From)
    $($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 -eq $true) {

        $("This email was signed.")

        # Check to see if the signatures were verified.
        if ($email.SignaturesValid -eq $true) {
            $("Digital signature(s) verified.")
            $("Signer: " + $email.SignedBy)

            # The certificate used for signing may be obtained
            # by calling email.GetSignedByCert.

            $cert = $email.GetSignedByCert()
            if ($email.LastMethodSuccess -eq $false) {
                $("Failed to get signing certificate object.")
            }
            else {
                $("Signing cert: " + $cert.SubjectCN)

            }

        }
        else {
            $("Digital signature verification failed.")
        }

    }

    $i = $i + 1
}

$mailman.Pop3EndSession()